Influence of Microstructure on Electrochemical Properties of Severely Deformed Al-5 wt% Cu Alloy by ECAP

Abstract:

The influence of microstructure on the electrochemical properties of an Al-5 wt% Cu binary alloy which was severely deformed by equal-channel angular pressing (ECAP) has been investigated in a borate-boric acid buffer solution containing Cl¯ ions at pH 8.3 and 25°C by potentiodynamic polarization test. The anodic polarization results showed that pitting potentials of ECAPed Al-Cu alloy samples were higher than that of the sample without ECAP and increased with repetitive ECAP passes. The pitting corrosion attack of Al-Cu alloy samples took place in the surroundings of Al2Cu (θ) phase. It is considered that the grain refinement of θ phase and the solid solution generated in Al matrix during ECAP process are responsible for the improvement of the corrosion resistance of ECAPed Al-Cu alloy.

• Periodical: Materials Science Forum (Volumes 519-521)
• Pages: 705-710
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.519-521.705
• Online since: July 2006
• Authors: Zuo Gui Zhang, Eiji Akiyama, Yoshimi Watanabe, Yasuyuki Katada, Kaneaki Tsuzaki
• Keywords: Al₂Cu Phases, Corrosion, Equal-Channel Angular Pressing (ECAP), Pitting

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