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

被引：0

作者：

Hwang, WS ^{[1
]}

Kim, HW ^{[1
]}

机构：

[1] Inha Univ, Sch Mat Sci & Engn, Nam Gu, Inchon 402751, South Korea

来源：

METALS AND MATERIALS INTERNATIONAL | 2002年 / 8卷 / 06期

关键词：

Al alloy; SiC; metal matrix composites; galvanic corrosion; pitting;

D O I：

10.1007/bf03178259

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页码：571 / 575

页数：5

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