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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Surface characteristics of chemical conversion coating for Mg-Al alloy
Masazumi OKIDO1, Ryoichi ICHINO1, Seong-Jong KIM2, Seok-Ki JANG2,

1. Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan;
2. Division of Marine Engineering, Mokpo Maritime University, Mokpo City, Jeonnam, 530-729, Korea

Abstract:The chemical conversion coating was formed on Mg alloy for low cost and harmlessness in environment by using the colloidal silica as the main component. The film formed at 298 K was thick, which was thought to be the combination of Si and O. In salt spray test, the ratio of black rust on the specimen that did not conducted chemical conversion treatment was five times or more than those of the chemical conversion treated specimen. The film of chemical conversion coating produced by alkali treatment process was thinner than the specimen produced in basic chemical conversion treatment solution.

 

Key words: chemical conversion coating; Mg alloy; salt spray test; alkali treatment

ISSN 1672-7029
CN 43-1423/U

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