Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 23    No. 9    September 2013

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Anisotropy of localized corrosion in 7050-T7451 Al alloy thick plate
Feng-xuan SONG, Xin-ming ZHANG, Sheng-dan LIU, Nian-mei HAN, Dong-feng LI

School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:The corrosion anisotropy of 7050-T7451 Al alloy thick plate in NaCl solution was investigated by immersion tests, slow strain rate testing (SSRT) technique, potentiodynamic and anode polarization measurements, optical microscropy (OM) and scanning electron microscopy (SEM) observations. The results show that the thick plate exhibits severe corrosion anisotropy due to the microstructure anisotropy. The observations of immersion surfaces together with the analysis of polarization curves reveal that the differences of the corrosion morphologies on various sections in this material are mainly related to the area fraction of the remnant second phase, and higher area fraction displays worst corrosion resistance. The stress corrosion cracking (SCC) susceptibility of different directions relative to the rolling direction is assessed by SSRT technique, ranked in the order: S direction > L direction > T direction. The result show that the smaller the grain aspect ratio, the better the corrosion resistance to SCC.


Key words: 7050-T7451 Al alloy; thick plate; microstructure; corrosion anisotropy

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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