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Navegação por Autores IPEN "DONATUS, UYIME"
Itens para a visualização no momento 1-20 de 35
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VIVEIROS, BARBARA V.G. de
; DONATUS, UYIME
; ALENCAR, MAICON C. de
; BERBEL, LARISSA O.
; COSTA, ISOLDA
. Comparing the corrosion behaviour of AA2050 and AA7050 aluminium alloys by scanning vibrating electrode and scanning ion-selective electrode techniques.
Corrosion Engineering, Science and Technology,
v. 57,
n. 1,
p. 85-96,
2022.
DOI:
10.1080/1478422X.2021.1992132
Abstract:
The susceptibility to localised corrosion of the high strength alloys, AA2050-T84 and AA7050-T7451, used in the aerospace industry, was investigated in this study by localised electrochemical techniques, specifically, scanning vibrating electrode technique (SVET) and scanning ion-selective electrode technique (SIET), in 0.005 mol L−1 NaCl solution. The study was initially carried out using both alloys individually and then, coupling the two alloys and evaluating the effect of galvanic coupling between them. The results revealed that the AA2050-T84, being nobler than the AA7050-T7451, presented higher corrosion current density values when tested in isolation and the depth of corrosion penetration was significantly deeper in the AA2050-T84 alloy than in the AA7050-T7451. However, galvanic coupling of the two alloys resulted in cathodic protection of the AA2050-T84 alloy and a reduction in corrosion current densities on both alloys.
Palavras-Chave: aluminium alloys; corrosion resistance; intergranular corrosion; pitting corrosion; coupling; electrochemical corrosion; electrodes; ion-selective electrodes
. Comparing the corrosion behaviour of AA2050 and AA7050 aluminium alloys by scanning vibrating electrode and scanning ion-selective electrode techniques. Corrosion Engineering, Science and Technology, v. 57, n. 1, p. 85-96, 2022. DOI: 10.1080/1478422X.2021.1992132. Disponível em: http://repositorio.ipen.br/handle/123456789/33038. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MILAGRE, MARIANA X.
; ARAUJO, JOAO V. de S.
; GOMES, MAURILIO P.
; DONATUS, UYIME
; MACHADO, CARULINE S.C.
; COSTA, ISOLDA
. Comparison of the corrosion resistance of AA2024 and AA2098 alloys in different solutions.
In: EUROPEAN CORROSION CONGRESS: APPLIED SCIENCE WITH CONSTANT AWARENESS,
September 9-13, 2018,
Krakow, Poland.
Proceedings...
Krakow: European Federation of Corrosion,
2018.
Abstract:
In this work the corrosion resistance of the AA2098-T351 and AA2024-T3 was evaluated and
compared by electrochemical tests in 0.01 mol.L-1 of NaCl and 0.1 mol.L-1 of Na2SO4 with 0.001
mol.L-1 NaCl electrolytes. Monitoring of corrosion evolution in both alloys was carried out by
electrochemical impedance spectroscopy (EIS) and polarization methods. The surface of the
samples exposed to the test solutions was observed by microscopy after corrosion tests. The results
showed different corrosion mechanisms in the two test solutions. In the sulfate containing
electrolyte, the Al-Cu-Li alloy showed corrosion mechanism mainly associated with the
micrometric particles at the surface, similarly to the AA2024-T3 alloy. However, in the chloride
solution without sulfate, the AA2098-T351 alloy showed susceptibility to severe localized corrosion
(SLC) besides the corrosion associated to the micrometric particles and the first type of corrosion
was the main type of attack. The AA2024-T3 showed lower susceptibility to SLC than the AA2098-
T351 alloy.
Palavras-Chave: corrosion resistance; corrosion resistant alloys; monitoring; electrochemistry; polarization; aluminium alloys; lithium alloys; spectroscopy; copper alloys
. Comparison of the corrosion resistance of AA2024 and AA2098 alloys in different solutions. In: EUROPEAN CORROSION CONGRESS: APPLIED SCIENCE WITH CONSTANT AWARENESS, September 9-13, 2018, Krakow, Poland. Proceedings... Krakow: European Federation of Corrosion, 2018. Disponível em: http://repositorio.ipen.br/handle/123456789/29753. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MILAGRE, MARIANA X.
; DONATUS, UYIME
; MACHADO, CARULINE S.C.
; ARAUJO, JOAO V.S.
; SILVA, REJANE M.P. da
; VIVEIROS, BARBARA V.G. de
; ASTARITA, ANTONELLO; COSTA, ISOLDA
. Comparison of the corrosion resistance of an Al–Cu alloy and an Al–Cu–Li alloy.
Corrosion Engineering, Science and Technology,
v. 54,
n. 5,
p. 402-412,
2019.
DOI:
10.1080/1478422X.2019.1605472
Abstract:
In this study, the corrosion mechanisms of the AA2024-T3 and the AA2098-T351 were investigated and
compared using various electrochemical techniques in 0.005 mol L−1 NaCl solution. The severe type of
corrosion in the AA2098-T351 was intragranular attack (IGA) although trenching and pitting related to
the constituent particles were seen. On the other hand, the AA2024-T3 exhibited severe localised
corrosion associated with micrometric constituent particles, and its propagation was via grain
boundaries leading to intergranular corrosion (IGC). Electrochemical techniques showed that the
corrosion reaction in both alloys was controlled by diffusion. The non-uniform current distribution
in both alloys showed that EIS was not a proper technique for comparing the corrosion resistance
of the alloys. However, local electrochemical techniques were useful for the evaluation of the
corrosion resistance of the alloys.
Palavras-Chave: corrosion resistance; corrosion resistant alloys; electrochemistry; electrochemical corrosion; aluminium base alloys; copper alloys; lithium base alloys
. Comparison of the corrosion resistance of an Al–Cu alloy and an Al–Cu–Li alloy. Corrosion Engineering, Science and Technology, v. 54, n. 5, p. 402-412, 2019. DOI: 10.1080/1478422X.2019.1605472. Disponível em: http://repositorio.ipen.br/handle/123456789/29964. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MACHADO, CARULINE de S.C.
; DONATUS, UYIME
; MILAGRE, MARIANA X.
; MOGILI, NAGA V.V.; GIORJÃO, RAFAEL A.R.; KLUMPP, RAFAEL E.
; ARAUJO, JOAO V. de S.
; FERREIRA, RAPHAEL O.; COSTA, ISOLDA
. Correlating the modes of corrosion with microstructure in the friction stir welded AA2198-T8 alloy in aqueous hydrogen peroxide-chloride medium.
Corrosion,
v. 75,
n. 6,
p. 628-640,
2019.
DOI:
10.5006/3054
Abstract:
In this study, different types of localized corrosion in the friction stir welding (FSW) zones of an AA2198-T8 when the alloy is subjected to
a corrosion test in a hydrogen peroxide–chloride solution (according to ASTM G110 standard) has been investigated. The corrosion
modes were correlated with microstructure, especially with respect to the T1 phase and coarse Al-Cu-Fe phase distribution across the
weldment. Simulated thermal profile and microhardness measurements were used to establish the variations in T1 phase distribution.
Two types of corrosion were observed in the FSW zones: intense pitting and intergranular corrosion—type I; and the formation of cavities
and trenches—type II. Type I is associated with the T1 phase while type II is associated with Al-Cu-Fe coarse intermetallics. Both types were
found on the base metal (BM) and heat affected zone, but the type I reduced in the latter toward the stir zone (SZ). The SZ/thermomechanically
affected zone (TMAZ) exhibited only type II. Also, Cu enrichment was observed around the type II sites in the SZ/TMAZ.
Furthermore, an inverse correlation between microhardness and corrosion resistance which was related to T1 phase concentration in the
different zones was also observed. Moreover, the SZ and BM were isolated and evaluated by an immersion test and electrochemical analysis
using the ASTM G110 test solution. The results indicated galvanic coupling effects, as the SZ was strongly attacked when exposed
separately compared to when it was coupled with the other zones.
Palavras-Chave: corrosion; friction welding; stirring; aluminium alloys; corrosion resistance; microhardness; microstructure; hydrogen peroxide; chlorides
. Correlating the modes of corrosion with microstructure in the friction stir welded AA2198-T8 alloy in aqueous hydrogen peroxide-chloride medium. Corrosion, v. 75, n. 6, p. 628-640, 2019. DOI: 10.5006/3054. Disponível em: http://repositorio.ipen.br/handle/123456789/30825. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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DONATUS, UYIME
; VIVEIROS, BARBARA V.G. de
; ALENCAR, MAICON C. de
; FERREIRA, RAPHAEL O.; MILAGRE, MARIANA X.
; COSTA, ISOLDA
. Correlation between corrosion resistance, anodic hydrogen evolution and microhardness in friction stir weldment of AA2198 alloy.
Materials Characterization,
v. 144,
p. 99-112,
2018.
DOI:
10.1016/j.matchar.2018.07.004
Abstract:
Correlation between corrosion resistance, anodic hydrogen evolution and microhardness in the friction stir weldment of AA2198-T851 alloy has been investigated. Different microscopy techniques, scanning vibrating electrode technique (SVET) and potentiodynamic polarization tests were employed in the investigation. Unlike other 3rd generation Al-Cu-Li alloys where the regions that are most susceptible to corrosion are always within the weld region, the results reveal that the parent material is the most susceptible in this case. There is a direct correlation between corrosion resistance, anodic hydrogen evolution and microhardness in the weldment, and the T1 phase is associated with the direct correlation.
Palavras-Chave: aluminium alloys; corrosion resistance; friction; microhardness; pitting corrosion; polarization; welded joints
. Correlation between corrosion resistance, anodic hydrogen evolution and microhardness in friction stir weldment of AA2198 alloy. Materials Characterization, v. 144, p. 99-112, 2018. DOI: 10.1016/j.matchar.2018.07.004. Disponível em: http://repositorio.ipen.br/handle/123456789/29299. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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DONATUS, UYIME
; FERREIRA, RAPHAEL O.; MOGILI, NAGA V.V.; VIVEIROS, BARBARA V.G. de
; MILAGRE, MARIANA X.
; COSTA, ISOLDA
. Corrosion and anodizing behaviour of friction stir weldment of AA2198- T851 Al-Cu-Li alloy.
Materials Chemistry and Physics,
v. 219,
p. 493-511,
2018.
DOI:
10.1016/j.matchemphys.2018.08.053
Abstract:
Anodizing behaviour of AA2198-T851 friction stir weldment and the corrosion behaviour of unpolished and
polished weldments of the alloy have been investigated. Electrochemical and microscopic techniques were
employed in the study. The results revealed that the manufacturing-process induced near-surface deformed layer
significantly affected the corrosion behaviour of the weldment. Thus, the corrosion behaviour of the weldment in
the polished condition (which is the common practice) was different from that of the unpolished one due to the
presence of near-surface deformed layer. Anodizing as a corrosion protection method for the weldment caused
the formation of pronounced non-uniform oxide layer thicknesses across the weld zones. This was because the
weldment oxidized at a higher rate compared with the parent material (PM) due to an increased proportion of Li
in solid solution in the stir zone of the weldment.
Palavras-Chave: chemical reactions; corrosion; anodization; aluminium alloys; friction welding; pitting corrosion; surface properties; lithium alloys; copper alloys; microstructure
. Corrosion and anodizing behaviour of friction stir weldment of AA2198- T851 Al-Cu-Li alloy. Materials Chemistry and Physics, v. 219, p. 493-511, 2018. DOI: 10.1016/j.matchemphys.2018.08.053. Disponível em: http://repositorio.ipen.br/handle/123456789/29418. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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BARBOZA, WANESSA das G.
; MILAGRE, MARIANA X.
; DONATUS, UYIME
; MACHADO, CARULINE de S.C.; RAMIREZ, OSCAR M.P.; ARAUJO, JOAO V. de S.
; SILVA, REJANE M.P. da
; COSTA, ISOLDA
. Corrosion behaviour of the 2098-T351 Al–Cu–Li alloy after different surface treatments.
Corrosion Engineering, Science and Technology,
v. 57,
n. 3,
p. 269-279,
2022.
DOI:
10.1080/1478422X.2022.2054915
Abstract:
The effect of different surface treatments on the corrosion resistance of the AA2098 Al–Cu–Li alloy has been investigated. Surface characterization was performed using 3D optical profilometry, energy dispersive X-ray spectroscopy and scanning electron microscopy. The corrosion resistance of the 2098 alloy after the surface treatments was investigated in 0.1 mol L−1 NaCl solution by electrochemical techniques and microscopy. Corrosion results showed that the untreated and the chemically etched surfaces were more active than the mechanically abraded and mechanically polished surfaces owing to differences in the nature of the native oxides formed after the surface treatments. Corrosion rate and mode were also affected by how close the exposed surface was to the mid-thickness region of the AA2098-T351 plate relative to the actual top surface (before polishing). This is associated with the variation in the volume fraction and distribution of the T1 phase as the mid-thickness region of the AA2098-T351 plate is approached.
Palavras-Chave: aluminium alloys; corrosion resistance; lithium alloys; copper alloys; surface treatments
. Corrosion behaviour of the 2098-T351 Al–Cu–Li alloy after different surface treatments. Corrosion Engineering, Science and Technology, v. 57, n. 3, p. 269-279, 2022. DOI: 10.1080/1478422X.2022.2054915. Disponível em: http://repositorio.ipen.br/handle/123456789/33277. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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KLUMPP, RAFAEL E.
; DONATUS, UYIME
; SILVA, REJANE M.P. da
; ANTUNES, RENATO A.; MACHADO, CARULINE de S.C.
; MILAGRE, MARIANA X.
; ARAUJO, JOAO V. de S.
; VIVEIROS, BARBARA V.G. de
; COSTA, ISOLDA
. Corrosion protection of the AA2198-T8 alloy by environmentally friendly organic-inorganic sol-gel coating based on bis-1,2-(triethoxysilyl) ethane.
Surface and Interface Analysis,
v. 53,
n. 3,
p. 314-329,
2021.
DOI:
10.1002/sia.6919
Abstract:
In this work, a surface coating composed of organic‐inorganic hybrid sol‐gel based on bis‐1,2‐(triethoxysilyl) (BTSE) ethane was applied on AA2198‐T8 samples, and its effect on corrosion resistance was investigated and compared with that of a chromate layer formed in a solution with hexavalent chromium ions. The corrosion resistance of BTSE coated samples was evaluated by immersion tests in sodium chloride solution (0.005 mol/L NaCl) and monitored by global electrochemical techniques such as electrochemical impedance spectroscopy (EIS) and local electrochemical techniques such as scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM). The formed coating layers were characterized by X‐ray photoelectron spectroscopy (XPS). The results pointed out that the BTSE is an effective alternative coating for corrosion protection of new generation Al‐Cu‐Li alloys and could replace chromates obtained in toxic and carcinogenic CrVI containing solutions leading to improved corrosion protection.
Palavras-Chave: corrosion; corrosion protection; surface coating; silanes; aluminium alloys; sol-gel process; hybrid systems; corrosion resistance
. Corrosion protection of the AA2198-T8 alloy by environmentally friendly organic-inorganic sol-gel coating based on bis-1,2-(triethoxysilyl) ethane. Surface and Interface Analysis, v. 53, n. 3, p. 314-329, 2021. DOI: 10.1002/sia.6919. Disponível em: http://repositorio.ipen.br/handle/123456789/31941. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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DONATUS, UYIME
; BODUNRIN, MICHAEL O.; OLAYINKA, AYOTUNDE; MILAGRE, MARIANA X.
; OLOYEDE, OLAMILEKAN R.; ARIBO, SUNDAY; ARAUJO, JOAO V. de S.
; MACHADO, CARULINE de S.C.
; COSTA, ISOLDA
. Corrosion resistance of precipitation-hardened Al alloys: a comparison between new generation Al-Cu-Li and conventional alloys.
In: DOBRZANSKI, LESZEK A. (Ed.).
Advanced Aluminium Composites and Alloys.
London, United Kingdom: IntechOpen,
2021.
p. 1-28,
cap. 5.
DOI:
10.5772/intechopen.92807
Abstract:
The corrosion resistance of conventional (AA2024-T3, AA6082-T6 and
AA7050-T7451) and the new generation (AA2050-T84, AA2098-T351, AA2198-T8,
and AA2198-T851) precipitation-hardened alloys has been studied and compared
using electrochemical and non-electrochemical approaches. The AA6082-T6 was
the most resistant alloy followed by the new generation Al-Cu-Li alloys, except the
AA2050-T84. All the alloys exhibited pseudo-passivity, except for the AA2024-T3
alloy which presented the highest number of pitting sites per cm2 and also exhibited
the most insidious form of corrosion amongst the alloys tested. However, the
alloy with the highest corrosion depth was the AA2050-T84 alloy followed by the
AA2024-T3 and AA7050-T7451 alloys. Intergranular corrosion was associated with
rapid rates of penetration. In addition to the microstructural features of the alloys
before corrosion, the modes of localized corrosion in the alloys were also influenced
by evolving microstructural features (such as re-deposited Cu) during corrosion.
Palavras-Chave: aluminium alloys; corrosion resistance; microstructure; aluminium compounds; electrochemistry
. Corrosion resistance of precipitation-hardened Al alloys: a comparison between new generation Al-Cu-Li and conventional alloys. In: DOBRZANSKI, LESZEK A. (ed.). Advanced Aluminium Composites and Alloys. London, United Kingdom: IntechOpen, 2021. cap. 5. p. 1-28. DOI: 10.5772/intechopen.92807. Disponível em: http://repositorio.ipen.br/handle/123456789/32811. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MACHADO, CARULINE de S.C.
; KLUMPP, RAFAEL E.
; AYUSSO, VICTOR H.
; DONATUS, UYIME
; MILAGRE, MARIANA X.
; ARAUJO, JOAO V. de S.
; MACHADO, GLAUSON A.F.
; COSTA, ISOLDA
. Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process.
Surface and Interface Analysis,
v. 51,
n. 12,
SI,
p. 1231-1239,
2019.
DOI:
10.1002/sia.6622
Abstract:
In this work, the effect of eight types of surface treatments on the corrosion resistance
of friction stir welded samples of an AA2198‐T8 Al‐Cu‐Li alloy were tested
and compared in an attempt to find suitable alternatives to toxic and carcinogenic
hexavalent chromium treatments. All the samples were anodized and subjected to different
post‐anodizing treatments. The post‐anodizing treatments were (1) hydrothermal
treatment in Ce (NO3)3 6H2O solution; (2) hydrothermal treatment in Ce (NO3)3
6H2O solution with H2O2; (3) hydrothermal treatment in boiling water; (4) hexavalent
chromium conversion coating; and (5) immersion in BTSE (bis‐1,2‐(triethoxysilyl)
ethane. The corrosion resistance of the treated samples was evaluated by immersion
tests in sodium chloride solution (0.1 mol L−1 NaCl) and electrochemical impedance
spectroscopy (EIS) of the friction stir weldment. The results showed that among the
alternative treatments, the Ce‐containing solutions presented the best corrosion
resistance, especially when used without peroxide.
Palavras-Chave: aluminium alloys; corrosion; corrosion resistance; lithium alloys; corrosion protection; friction welding; anodization; copper alloys; chromium; scanning electron microscopy
. Effect of surface treatments on the localized corrosion resistance of the AA2198‐T8 aluminum lithium alloy welded by FSW process. Surface and Interface Analysis, v. 51, n. 12, p. 1231-1239, 2019. SI, DOI: 10.1002/sia.6622. Disponível em: http://repositorio.ipen.br/handle/123456789/30320. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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QUEIROZ, FERNANDA M.; DONATUS, UYIME
; RAMIREZ, OSCAR M.P.; ARAUJO, JOAO V. de S.
; VIVEIROS, BARBARA V.G. de
; LAMAKA, SVIATLANA; ZHELUDKEVICH, MIKHAIL; MASOUMI, MOHAMMAD; VIVIER, VINCENT; COSTA, ISOLDA
; MELO, HERCILIO G. de. Effect of unequal levels of deformation and fragmentation on the electrochemical response of friction stir welded AA2024-T3 alloy.
Electrochimica Acta,
v. 313,
p. 271-281,
2019.
DOI:
10.1016/j.electacta.2019.04.137
Abstract:
The effect of unequal levels of deformation and fragmentation on the electrochemical response of friction
stir welded AA2024-T3 has been investigated using electron backscatter diffraction, scanning electron
microscopy, global and localized electrochemical techniques. The friction stir welding process introduced
unequal distribution and fragmentation of coarse intermetallic particles, such that more clusters of these
particles were present in the thermomechanically affected zone of the weld. This resulted in a higher
susceptibility to severe localized corrosion in this region when compared with the others. Results from
electrochemical measurements using a microcell could not be clearly correlated with the corrosion
behaviour because no significant differences were observed using these techniques. On the other hand,
LEIS and SVET results were in agreement and correlated with the corrosion evolution at the surfaces of
the tested samples.
Palavras-Chave: aluminium alloys; electrochemistry; electrochemical cells; microstructure; corrosion; friction welding; cluster analysis; methylene blue; nanomaterials; optical properties; staphylococcus; inactivation; shells; bacteria
. Effect of unequal levels of deformation and fragmentation on the electrochemical response of friction stir welded AA2024-T3 alloy. Electrochimica Acta, v. 313, p. 271-281, 2019. DOI: 10.1016/j.electacta.2019.04.137. Disponível em: http://repositorio.ipen.br/handle/123456789/29976. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MACHADO, CARULINE de S.C.
; SILVA, REJANE M. da
; ARAUJO, JOAO V. de S.
; DONATUS, UYIME
; MILAGRE, MARIANA X.
; KLUMPP, RAFAEL E.
; ROSSI, JESUALDO L.
; COSTA, ISOLDA
. Effects of chloride ion concentration on the corrosion behavior of the AA2198-T8 alloy.
In: EUROPEAN CORROSION CONGRESS,
September 9-13, 2019,
Seville, Spain.
Proceedings...
2019.
Abstract:
In this work, the influence of chloride ions concentration on the corrosion behavior of the AA2198-T8 alloy was evaluated. Immersion test and electrochemical analyses were performed in sodium chloride solutions of three concentrations, 0.001 mol L-1, 0.005 mol L-1 and 0.01 mol L-1. The results showed that the AA2198-T8 alloy was susceptible to localized corrosion (LC) and to severe localized corrosion (SLC) in all conditions investigated. The electrochemical results obtained by open circuit potential measurements, cyclic voltammetry and potentiodynamic polarization curves were associated with the corroded microstructure of the alloy. Although electrochemical techniques allowed differentiating the corrosion resistance as a function of chloride concentration, the result was strongly influenced by the corroded/uncorroded area ratio related to the SLC.
Palavras-Chave: aluminium alloys; corrosion; electrochemical corrosion; electrochemistry; chlorides
. Effects of chloride ion concentration on the corrosion behavior of the AA2198-T8 alloy. In: EUROPEAN CORROSION CONGRESS, September 9-13, 2019, Seville, Spain. Proceedings... 2019. Disponível em: http://repositorio.ipen.br/handle/123456789/31028. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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RAMIREZ, OSCAR M.P.; QUEIROZ, FERNANDA M.; TERADA, MAYSA; DONATUS, UYIME
; COSTA, ISOLDA
; OLIVIER, MARIE-GEORGES; MELO, HERCILIO G. de. EIS investigation of a Ce‐based posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA.
Surface and Interface Analysis,
v. 51,
n. 12,
SI,
p. 1260-1275,
2019.
DOI:
10.1002/sia.6633
Abstract:
In the aircraft industry, anodizing and posttreatment steps use Cr (VI) compounds,
which, despite offering good corrosion resistance and self‐healing properties, are
highly toxic and carcinogenic. Ce compounds are recognized as efficient corrosion
inhibitors for Al alloys, and several works report self‐healing ability for these
chemicals. In this investigation, the corrosion resistance of Alclad AA2024‐T3 alloy
anodized in tartaric‐sulphuric acid (TSA) bath and posttreated in a solution comprising
cerium nitrate without and with hydrogen peroxide was evaluated. The purpose is to
investigate the potentiality of using hydrothermal treatment in Ce nitrate solution as
candidate to replace Cr (VI) posttreatment. The aim is to provide a posttreatment step
which, while improving the corrosion resistance, does not plug the mouths of the
pores maintaining the adhesion properties of the porous anodic layer. Microstructural
characterization was carried out by SEM‐EDS whereas corrosion resistance was evaluated
by EIS. The surface analysis showed that the posttreatments, all performed at
50°C, kept the open structure of the pores. EIS analysis showed that the
posttreatments performed in the H2O2 solution for short immersion times were the
most effective in improving the corrosion resistance of the samples, whereas electrical
equivalent circuit (EEC) fitting of the data indicated sealing of the porous layer
during the immersion of the different samples in the test solution. SEM‐EDS analysis
of the samples posttreated in the H2O2 containing solution, prior and after the corrosion
test, showed the presence of Ce oxy‐hydroxide randomly deposited on the sample
surface, indicating that Ce could be incorporated/stored in the anodic layer.
Palavras-Chave: aluminium alloys; anodization; cerium nitrates; equivalent circuits; impedance; spectroscopy; electrochemical cells; corrosion resistance; tartaric acid; sulfuric acid
. EIS investigation of a Ce‐based posttreatment step on the corrosion behaviour of Alclad AA2024 anodized in TSA. Surface and Interface Analysis, v. 51, n. 12, p. 1260-1275, 2019. SI, DOI: 10.1002/sia.6633. Disponível em: http://repositorio.ipen.br/handle/123456789/30321. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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MILAGRE, MARIANA X.
; DONATUS, UYIME
; MACHADO, CARULINE S.C.
; ARAUJO, JOAO V.S.
; FERREIRA, RAPHAEL O.; SILVA, REJANE M.P.
; ANTUNES, RENATO A.; COSTA, ISOLDA
. Exfoliation corrosion susceptibility in the zones of friction stir welded AA2098-T351.
Journal of Materials Research and Technology,
v. 8,
n. 6,
p. 5916-5929,
2019.
DOI:
10.1016/j.jmrt.2019.09.066
Abstract:
In the present study, the exfoliation susceptibility of the weld zones in friction stir weldedAA2098-T351 was compared with that of the base metal (BM) according to ASTM G34 stan-dard practice. Friction stir welding (FSW) had a significant effect on the microstructure of theAl alloy tested and the susceptibility to exfoliation was strongly affected by the microstruc-ture. Different features of corrosion attack and exfoliation susceptibility were observed whenthe zones affected by FSW were tested isolated or coupled. Also, the near-surface deformedlayer had an important effect on the Al alloy susceptibility to exfoliation. These are themain findings of this work. The corrosion features were correlated with the microstructuralmodifications related to the welding process and with the electrochemical response. TheT1 phase morphology, distribution and size were critical for exfoliation susceptibility. Thestir zone (SZ) was the zone most resistant to exfoliation. However, resistance to exfoliationvaried with the temperatures reached in the heat affected zones (HAZs). The HAZ exposedto the lowest temperatures during welding, HAZ (LT), was the most susceptible to exfoli-ation, whereas the HAZ exposed to the highest temperatures, HAZ (HT), presented highresistance to exfoliation, similarly to the SZ. The ASTM-G34 practice was an effective anduseful method in identifying the different exfoliation resistances of the BM and the vari-ous zones affected by FSW. The results of this practice were supported by electrochemicalimpedance spectroscopy (EIS) tests.
Palavras-Chave: corrosion; aluminium alloys; friction welding; microstructure; intergranular corrosion; grain boundaries; copper alloys; lithium alloys; temperature dependence
. Exfoliation corrosion susceptibility in the zones of friction stir welded AA2098-T351. Journal of Materials Research and Technology, v. 8, n. 6, p. 5916-5929, 2019. DOI: 10.1016/j.jmrt.2019.09.066. Disponível em: http://repositorio.ipen.br/handle/123456789/30815. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
-
MILAGRE, MARIANA X.
; DONATUS, UYIME
; MACHADO, CARULINE S.C.
; ARAUJO, JOAO V. de S.
; MOGILI, VISHNU; ASTARITA, ANTONELLO; COSTA, ISOLDA
. Exfoliation susceptibility of aluminum alloys joined by Friction Stir Welding (FSW).
In: EUROPEAN CORROSION CONGRESS: APPLIED SCIENCE WITH CONSTANT AWARENESS,
September 9-13, 2018,
Krakow, Poland.
Proceedings...
Krakow: European Federation of Corrosion,
2018.
Abstract:
In the present study, the exfoliation susceptibility of a commercial Al-Cu-Li alloy of the third
generation, AA2098-T351, joined by FSW was investigated according to ASTM G34 standard
practice and the results were compared with the results of the parent material. Susceptibility to
exfoliation attack was classified by the depth of attack penetration. The cross-sections of the
samples after test were observed by optical and scanning electron microscopy (SEM) to
evaluate the penetration depth of corrosion attack. A comparison to conventional Al-Cu alloys
(AA2024-T3/T351) was carried out and the results showed that the Al-Cu-Li alloy tested
(AA2098-T351) was more susceptible to exfoliation. Besides, exfoliation susceptibility varied
with each welded zone and the active zones remained active for long periods of time after
removal from the test solution when the attack continuously propagated in the corrosion front.
Palavras-Chave: aluminium alloys; corrosion resistant alloys; friction welding; scanning electron microscopy; copper alloys; lithium alloys; materials testing; intergranular corrosion
. Exfoliation susceptibility of aluminum alloys joined by Friction Stir Welding (FSW). In: EUROPEAN CORROSION CONGRESS: APPLIED SCIENCE WITH CONSTANT AWARENESS, September 9-13, 2018, Krakow, Poland. Proceedings... Krakow: European Federation of Corrosion, 2018. Disponível em: http://repositorio.ipen.br/handle/123456789/29754. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
-
MILAGRE, MARIANA X.
; DONATUS, UYIME
; MOGILI, NAGA V.; SILVA, REJANE M.P.
; VIVEIROS, BARBARA V.G. de
; PEREIRA, VICTOR F.; ANTUNES, RENATO A.; MACHADO, CARULINE S.C.
; ARAUJO, JOAO V.S.
; COSTA, ISOLDA
. Galvanic and asymmetry effects on the local electrochemical behavior of the 2098-T351 alloy welded by friction stir welding.
Journal of Materials Science & Technology,
v. 45,
p. 162-175,
2020.
DOI:
10.1016/j.jmst.2019.11.016
Abstract:
Scanning electrochemical microscopy (SECM) and scanning vibrating electrode technique (SVET) were
used to investigate the electrochemical behaviour of the top surface of the 2098-T351 alloy welded by
friction stir welding (FSW). The SVET technique was efficient in identifying the cathodic and anodic weld
regions. The welding joint (WJ), which comprises the thermomechanically affected zone (TMAZ) and
the stir zone (SZ), was cathodic relative to the heated affected zone (HAZ) and the base metal (BM). The
reactivities of the welding joint at the advancing side (AS) and the retreating side (RS) were analyzed
and compared using SECM technique in the competition mode by monitoring the dissolved oxygen as a
redox mediator in 0.005 mol L−1 NaCl solution. The RS was more electrochemically active than the AS,
and these results were correlated with the microstructural features of the welded alloy.
Palavras-Chave: electrochemistry; scanning electron microscopy; friction; welding; welded joints; stirring; corrosion; corrosion resistance; electrochemical corrosion
. Galvanic and asymmetry effects on the local electrochemical behavior of the 2098-T351 alloy welded by friction stir welding. Journal of Materials Science & Technology, v. 45, p. 162-175, 2020. DOI: 10.1016/j.jmst.2019.11.016. Disponível em: http://repositorio.ipen.br/handle/123456789/31404. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
-
MACHADO, CARULINE de S.C.
; DONATUS, UYIME
; MILAGRE, MARIANA X.
; ARAUJO, JOAO V. de S.
; VIVEIROS, BARBARA V.G. de
; KLUMPP, RAFAEL E.
; PEREIRA, VICTOR F.; COSTA, ISOLDA
. How microstructure affects localized corrosion resistance of stir zone of the AA2198-T8 alloy after friction stir welding.
Materials Characterization,
v. 174,
p. 1-14,
2021.
DOI:
10.1016/j.matchar.2021.111025
Abstract:
In this study, the microstructure and corrosion resistance of the stir zone (SZ) of the AA2198-T8 Al-Cu-Li alloy welded by friction stir welding (FSW) were investigated by microscopy, immersion tests and electrochemical techniques such as measurements of open circuit potential variation with time, and scanning vibrating electrode technique (SVET) measurements. A low chloride-containing solution (0.005 mol L−1 NaCl) was employed in the corrosion studies and severe localized corrosion (SLC) was observed in the SZ related to intergranular attack. The results were compared to those of the non-affected areas by FSW, also known as base metal (BM). In the BM, SLC was found and the type of attack related to it was intragranular. In both zones, BM and SZ, SLC was due to precipitates of high electrochemical activity, specifically T1 (Al2CuLi) phase in the BM, whereas TB (Al7Cu4Li) / T2 (Al6CuLi3) in the SZ. Scanning vibrating electrode technique (SVET) analysis was very useful in the study of SLC in the AA2198-T8 alloy showing the development of high anodic current densities at the mouth of the SLC sites.
Palavras-Chave: electrochemistry; friction welding; stir reactor; corrosion resistance; microstructure
. How microstructure affects localized corrosion resistance of stir zone of the AA2198-T8 alloy after friction stir welding. Materials Characterization, v. 174, p. 1-14, 2021. DOI: 10.1016/j.matchar.2021.111025. Disponível em: http://repositorio.ipen.br/handle/123456789/32041. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
-
MACHADO, CARULINE de S.C.
; SILVA, REJANE M.P. da
; ARAUJO, JOAO V. de S.
; MILAGRE, MARIANA X.
; DONATUS, UYIME
; VIVEIROS, BARBARA V.G. de
; KLUMPP, RAFAEL E.
; COSTA, ISOLDA
. Influence of chloride ions concentration on the development of severe localised corrosion and its effects on the electrochemical response of the 2198-T8 alloy.
Corrosion Engineering, Science and Technology,
v. 56,
n. 4,
p. 341-350,
2021.
DOI:
10.1080/1478422X.2020.1862390
Abstract:
The development of severe localised corrosion (SLC) on the 2198-T8 alloy was investigated in
solutions of various NaCl concentrations (0.001, 0.005 and 0.01 mol L−1). Immersion tests, optical
profilometry, conventional and local electrochemical analyses were performed to evaluate the
corrosion behaviour of the alloy. Immersion tests showed that the alloy is susceptible to SLC in all
conditions, although the pits sizes were dependent on the solution concentration. The largest
anodic areas, corresponding to SLC sites, were observed for the sample immersed in 0.001 mol L−1
NaCl, whereas pits with similar sizes were observed for the samples immersed in solutions with
0.005 and 0.01 mol L−1 of NaCl. Moreover, the maximum depth of attack was observed for the
sample immersed in 0.001 mol L−1 NaCl. These results were in agreement with the scanning ionselective
electrode technique (SIET) maps which showed stronger acidification on the sample
exposed to 0.001 mol L−1 NaCl solution.
Palavras-Chave: aluminium alloys; lithium alloys; copper alloys; chlorides; ions; corrosion
. Influence of chloride ions concentration on the development of severe localised corrosion and its effects on the electrochemical response of the 2198-T8 alloy. Corrosion Engineering, Science and Technology, v. 56, n. 4, p. 341-350, 2021. DOI: 10.1080/1478422X.2020.1862390. Disponível em: http://repositorio.ipen.br/handle/123456789/32809. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
-
SILVA, REJANE
; MILAGRE, MARIANA
; OLIVEIRA, LEANDRO; ANTUNES, RENATO; DONATUS, UYIME
; COSTA, ISOLDA
. Influence of surface finishing on the electrochemical activity of the 2098-T351 aluminum alloy.
In: EUROPEAN CORROSION CONGRESS,
September 9-13, 2019,
Seville, Spain.
Abstract...
2019.
Abstract:
In this work, scanning electrochemical microscopy (SECM) measurements were employed to
characterize the electrochemical activities of polished and as-received surfaces of the 2098-T351
aluminum alloy (AA2098-T351). The effects of the near surface deformed layer (NSDL) and its
removal by polishing on the electrochemical activities of the alloy surface were evaluated and
compared by the use of different modes of SECM. Confocal Laser Scanning Microscopy
(CLSM) and energy dispersive X-ray spectroscopy (EDS) were also employed to characterize the
morphology of the surfaces. The surface chemistry was analyzed by X-ray Photoelectron
Spectroscopy (XPS). The generation/tip collection (SG/TC) and competition modes of the SECM
were used to study hydrogen gas (H2) evolution and oxygen reduction reactions, respectively. H2
evolution and oxygen reduction were more pronounced on the polished surface compared to the asreceived
surface that revealed lower electrochemical activities showing that either the NSDL
largely decreased the local electrochemical activities at the AA2098-T351 surface.
. Influence of surface finishing on the electrochemical activity of the 2098-T351 aluminum alloy. In: EUROPEAN CORROSION CONGRESS, September 9-13, 2019, Seville, Spain. Abstract... 2019. Disponível em: http://repositorio.ipen.br/handle/123456789/31029. Acesso em: $DATA.Como referenciar este item
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
-
KLUMPP, RAFAEL E.
; SILVA, REJANE M.P. da; DONATUS, UYIME
; MACHADO, CARULINE de S.C.
; AYUSSO, VICTOR H.
; MILAGRE, MARIANA X.
; ARAUJO, JOAO V. de S.
; COSTA, ISOLDA
. Influência da composição da solução de tratamento de superfície na resistência à corrosão da liga AA2024-T3.
Tratamento de Superfície,
n. 212,
p. 23-28,
2019.
Abstract:
Os tratamentos de superfície de ligas de alumínio em soluções contendo íons de terras raras
têm se mostrado promissores para a substituição dos tratamentos que utilizam íons de
cromo hexavalente em sua composição. A composição das soluções de tratamento com terras
raras é um fator importante na propriedade de proteção à corrosão da camada superficial
formada. Neste trabalho, o efeito da adição de peróxido de hidrogênio à solução de tratamento
para proteção à corrosão da liga AA2024-T3 foi investigado por técnicas eletroquímicas e
microscópicas. Os resultados mostraram que a adição do peróxido de hidrogênio altera a
morfologia da camada, o mecanismo de formação desta e resulta em propriedades de proteção
levemente inferiores às da camada formada na ausência de peróxido.
Palavras-Chave: aluminium alloys; corrosion protection; hydrogen peroxide; corrosion resistant alloys; layers; atomic force microscopy; scanning electron microscopy; spectroscopy; electric impedance; cerium nitrates
. Influência da composição da solução de tratamento de superfície na resistência à corrosão da liga AA2024-T3. Tratamento de Superfície, n. 212, p. 23-28, 2019. Disponível em: http://repositorio.ipen.br/handle/123456789/29713. Acesso em: $DATA.Como referenciar este itemEsta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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