Research progress on relationship between alloy phase and corrosion resistance in Zn-Al-Mg coating

被引：0
|
作者：
Zou J.-G. [1 ,2 ]
Lu L. [1 ,2 ]
机构：
[1] National Material Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing
[2] Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Al-Zn-Mg alloy coating; Alloy phase; Atmospheric corrosion; Corrosion products; Corrosion resistance;
D O I：
10.11817/j.ysxb.1004.0609.2021-37943
中图分类号：
学科分类号：
摘要：
With the deterioration of the service environment of materials, Zn-Al-Mg (ZAM) coatings have been received widespread attention due to their excellent corrosion resistance. From the perspective of alloying elements, this article discussed its influence on the formation of alloy phases in ZAM and even the corrosion resistance of the coating and its mechanism of action. At the same time, through the summary of the corrosion behavior of ZAM in the atmosphere, the corrosion mechanism of the coating was explained from the perspective of corrosion products. It was generally believed that MgZn2 was preferentially corroded as an anode, thereby generating Mg2+ and Zn2+. Mg2+ can inhibit the pH increase of the corrosive environment, thereby preventing the protective corrosion product (Zn5(OH)8Cl2·H2O) from transforming to the non-protective corrosion product (ZnO) at high pH scale. The production of Zn2+ is more conducive to the formation of protective corrosion products (LDH; double-layer hydroxide). However, the current research still has certain shortcomings. Especially, the corrosion mechanism caused by the complex phase structure in the ZAM coating with high aluminum content is still unclear. These are the focus of future research on ZAM coatings. © 2022, China Science Publishing & Media Ltd. All right reserved.
引用
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页码：1934 / 1944
页数：10
相关论文
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