Galvanic coupling effect on corrosion behavior of Al alloy-matrix composites

被引：0
作者：
Woon Suk Hwang
Hyoun Woo Kim
机构：
[1] Inha University,School of Material Science and Engineering
来源：
Metals and Materials International | 2002年 / 8卷 / 6期
关键词：
Al alloy; SiC; metal matrix composites; galvanic corrosion; pitting;
D O I：
10.1007/BF03178259
中图分类号：
学科分类号：
摘要：
Galvanic coupling effect on the corrosion of SiC-reinforced aluminum alloy-matrix composites was investigated in a sodium chloride solution. The potentiodynamic polarization measurement indicated that pitting potentials of metal matrix composites (MMCs) and AA2124 matrix alloy were similar, and pitting potential of MMCs was almost same as corrosion potential, while pitting susceptibility of MMCs was higher than that of AA2124 alloy. Galvanic current by formation of galvanic couple between SiCw and matrix reveals very low value because of large cathodic polarization of SiC. However, by increasing potential of matrix to pitting potential by this galvanic couple and thus, forming pits easily at the weak passive film near SiC reinforcing phase preferentially, it is concluded that pitting susceptibility of MMCs increases highly than AA2124 alloy of matrix composition.
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页码：571 / 575
页数：4
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