Corrosion behaviour of Zn-Al pseudo-alloy coating on carbon steel in chloride environments

被引：10
|
作者：
Liu An Qiang [1 ]
Xiao Kui [1 ]
Dong Chao Fang [1 ]
Li Xiao Gang [1 ]
机构：
[1] Univ Sci & Technol Beijing, Adv Mat & Technol Inst, Beijing 100083, Peoples R China
来源：
METALLURGY TECHNOLOGY AND MATERIALS | 2012年 / 567卷
关键词：
arc thermal spraying; Zn-Al pseudo-alloy coating; corrosion behavior; salt spray test;
D O I：
10.4028/www.scientific.net/AMR.567.45
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, Zn-Al alloy and Zn-Al pseudo-alloy coatings are deposited on carbon steel by arc spray technology. The corrosion behaviour of the coatings has been studied by salt spray test and electrochemical experiment. The morphology of the coatings exposed to salt spray test for 400 h was analyzed using SEM and EDS. Results show that corrosion rate of Zn-Al alloy coating is faster than that of Zn-Al pseudo-alloy coating and the steel substrate is attacked. The corrosion products formed on the surface of Zn-Al alloy coating were loose, with a large number of cracks and holes, but the Zn-Al pseudo-alloy coating is converted into a stable Al-rich oxide layer, which protects the steel substrate against corrosive attacks and enhances the corrosion resistance of the Zn-Al pseudo-alloy coating. Electrochemical tests show the Zn-Al pseudo-alloy coating as a sacrificial protection coating has the capability of providing sacrificial protection for the steel substrate.
引用
收藏
页码：45 / 48
页数：4
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