The influence of grain structure on the corrosion behaviour of 2A97-T3 Al-Cu-Li alloy

Zhang, X.; Zhou, Xiaorong; Hashimoto, Teruo; Lindsay, J.; Ciuca, Octav; Luo, Chen; Sun, Zhenqiu; Zhang, X.; Tang, Ziyang

doi:10.1016/j.corsci.2016.12.005

Cited by 110 publications

(41 citation statements)

References 20 publications

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“…In addition, the number density of intergranular precipitates decreased, causing the corrosion potential of the grain boundary to become more negative [22]. Therefore, the difference in the electrochemical behavior of the grain boundaries and grain interior reduced to a degree at which IGC hardly ever occurs, thereby resulting in a significant elevation in IGC resistance [13,[23][24][25][26]. Because of the negative corrosion potential of the intragranular precipitates, the matrix became more susceptible to corrosion, which is in line with the intragranular pitting corrosion of the pre-strained samples [3,13].…”

Section: Discussionmentioning

confidence: 99%

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

Deng

Chen

2020

Materials

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The influences of aging treatments on microstructures and the corrosion properties of an Al–Cu–Li alloy were investigated through an immersion test in intergranular corrosion (IGC) solutions, a potentiodynamic polarization test, and electrochemical impedance spectra (EIS), combined with scanning and transmission electron microscopy. The results demonstrated that the Al–Cu–Li alloy displayed outstanding comprehensive mechanical properties and IGC resistance after treating with pre-strain deformation and a double aging process (PDA). Both the PDA and pre-strain followed by creep aging (PCA) treatments significantly increased the number densities of T1 and θ’ precipitates in the grain interior. The increase in precipitates in the grain interior greatly reduced the Cu-rich precipitates on the grain boundaries and inhibited the formation of a precipitate-free zone (PFZ). The electrochemical characteristics of the Al–Cu–Li alloy were influenced by the precipitates in the grain interior and grain boundaries. The studied alloy gained high IGC resistance due to the refinement of its microstructure, and the main corrosion mode was intra-granular pitting corrosion; thus, the corrosion diffusion rate was slowed down.

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Section: Discussionmentioning

confidence: 99%

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

Deng

Chen

2020

Materials

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“…However, this element increases the susceptibility of the alloy to localized corrosion . Several works in the literature have indicated that Al‐Cu‐Li alloys are highly susceptible to localized corrosion . Thus, the investigation of localized corrosion in the new generation alloys is highly important.…”

Section: Introductionmentioning

confidence: 99%

The local electrochemical behavior of the AA2098‐T351 and surface preparation effects investigated by scanning electrochemical microscopy

Silva

Milagre

Oliveira

et al. 2019

Surface & Interface Analysis

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In this work, scanning electrochemical microscopy (SECM) measurements were employed to characterize the electrochemical activities on 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 scanning electron microscopy (SEM) were also employed to characterize the morphology of the surfaces. The surface chemistry was analyzed by X-ray photoelectron spectroscopy (XPS). The surface generation/tip collection (SG/TC) and competition modes of the SECM were used to study hydrogen gas (H 2 ) evolution and oxygen reduction reactions, respectively. H 2 evolution and oxygen reduction were more pronounced on the polished surfaces. The feedback mode of SECM was adopted to characterize the electrochemical activity of the polished surface that was previously corroded by immersion in a chloride-containing solution, in order to investigate the influence of the products formed on the active/passive domains. The precorroded surface and as-received surfaces revealed lower electrochemical activities compared with the polished surface showing that either the NSDL or corrosion products largely decreased the local electrochemical activities at the AA2098-T351 surfaces. KEYWORDS aluminum alloy, localized corrosion, SECM, surface finishing condition 1 | INTRODUCTION Aluminum alloys are commonly used in automotive and aerospace applications because of their good mechanical properties and low density.There is an increase in the demand for materials that exhibit a combination of high specific strength and corrosion resistance for industrial applications. 1,2 In order to meet this demand, new generation aluminum-lithium (Al-Li) alloys with properties superior to those of the conventionally used Al alloys are being developed for use as structural components in aircraft. [3][4][5] The AA2098 Al-Cu-Li alloy was developed as a substitute for AA2024 and AA2219. The AA2098 alloy presents low density, high mechanical resistance, high toughness, high-temperature resistance, weldability, and good response to natural aging. These properties are achieved by a carefully tailoring its chemical composition, whose main alloying elements are Cu, Li, Mg, Ag, and Zr. The addition of lithium improves the mechanical properties of the Al alloy in that for every 1 wt% of Li added to aluminum, the density of the alloy is reduced by 3%, and the Young's modulus is increased by almost 6%. 5-7 However, this element increases the susceptibility of the alloy to localized

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“…Isso demonstra que a dissolução anódica da matriz que envolve a fase T1 é facilitada, tornando essa região mais suscetível ao ataque comparativamente a região que envolve a fase T2 [146]. A diferença na proporção dos elementos ativos e nobres também tem sido utilizada para justificar a menor reatividade da fase TB em relação à T1 [147] Com base nos resultados de SVET para a ZM apresentados anteriormente (micrografias e mapas de densidade de corrente iônica) é razoável atribuir os dois diferentes comportamentos da curva de OCP da ZM: 1) Queda do potencial: ataque ao filme óxido por íons Cle desenvolvimento da CLS;…”

Section: Avaliação Da Resistência à Corrosãounclassified

Estudo da corrosão localizada da liga de alumínio 2198-T8 soldada por fricção e mistura

Machado¹

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À Deus, por sua infinita bondade e misericórdia durante toda a minha vida, por me permitir chegar até aqui e realizar em minha vida muito além do que eu poderia imaginar. À minha orientadora Dra. Isolda Costa, a qual sou imensamente grata pela oportunidade de ter sido aluna. Obrigada por partilhar seu conhecimento, amizade e cuidado durante todo este trabalho. Sem dúvidas, um exemplo de profissionalismo e dedicação que inspira diariamente aos que convivem com ela. Agradeço também por todas as vezes que me hospedou em sua residência e estendo meus agradecimentos a toda sua família (Dr. Jesualdo L. Rossi, Alexandre, Helena, Dona Dilza) e a Vânia. À minha família, presente de Deus para mim. Agradeço todos os dias a Deus por tê-los comigo. Por todo amor e cuidado, pelo incentivo durante este trabalho, pelo apoio nos momentos difíceis. Gratidão aos meus pais Arlindo e Glória por me darem condições de estudar, a minha irmã Poliana pela amizade e preocupação comigo e a minha tia Ivanilse. AMO VOCÊS! À Dra. Mariana X. Milagre, que ao longo desses 14 anos tem compartilhado, além da vida acadêmica, importantes mudanças e momentos na minha vida. Agradeço a Deus pela sua amizade. Gratidão também pelas contribuições técnicas ao longo deste trabalho. Aos amigos que fiz durante esta jornada: mestre João Victor S. Araujo, doutorando Rafael E. Klumpp e Dra. Rejane M. P. da Silva. Pelos momentos na copa e fora dela que, como eu sempre digo-são esses momentos que levaremos...‖. Vocês tornaram essa caminhada mais prazerosa, especialmente neste final. Agradeço também ao João Victor e sua família por me receberem em momentos de confraternização. Ao Dr. Uyime Donatus por contribuir no meu desenvolvimento acadêmico e pelo seu bom-humor contagiante. Thanks for everything man, forever! Ao Dr. Caio P. Abreu e ao mestre Marcelo de Oliveira pelos momentos compartilhados dentro e fora do IPEN. Embora tenha sido um curto período de convivência no laboratório, serão sempre lembrados por mim com muito carinho. Agradeço ainda a Dra. Fernanda M. Queiroz que, mesmo longe, me ajudou com palavras de incentivo em alguns momentos difíceis dessa caminhada. Aos demais colegas do grupo: Luzinete,

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The influence of grain structure on the corrosion behaviour of 2A97-T3 Al-Cu-Li alloy

Cited by 110 publications

References 20 publications

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

Enhancing the Corrosion Resistance of Al–Cu–Li Alloys through Regulating Precipitation

The local electrochemical behavior of the AA2098‐T351 and surface preparation effects investigated by scanning electrochemical microscopy

Estudo da corrosão localizada da liga de alumínio 2198-T8 soldada por fricção e mistura

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