Effect of thermally induced relaxation on passivity and corrosion of an amorphous Al-Co-Ce alloy

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• 作者：N.R. Tailleart ; ^{nrt2e@virginia.edu} ; R. Huang ; T. Aburada ; D.J. Horton ; J.R. Scully
• 关键词：A. Aluminium ; A. Alloy ; B. AFS ; B. EIS ; C. Pitting corrosion ; C. Passivity
• 刊名：Corrosion Science
• 出版年：2012
• 期刊代码：28_0010938x
• 类别：ch
• 出版时间：June, 2012
• 卷：59
• 期：Complete
• 页码：238-248
• 文件大小：2304 K

摘要

The corrosion behavior of Al₈₇Co₇Ce₆ alloy was investigated in the amorphous as-quenched, amorphous thermally relaxed, and two partially devitrified conditions using AC and DC electrochemical methods combined with high resolution microscopy in the active dissolution and passivity-local breakdown regimes. The best corrosion resistance was observed after relaxation. Intermediate behavior was observed in a partially devitrified treatment that formed small fcc Al particles and intermetallic phases. Further devitrification decreased the corrosion resistance. The amorphous 鈥渞elaxed condition鈥? characterized by EXAFS, is an Al-Co-Ce solid solution with short bond length, high coordination number and reduced free volume compared to the as-quenched amorphous state.