Ce对Zn-Al-Mg合金镀层组织和耐腐蚀性能的影响

蒋红兵, 李强, 徐巍, 田银宝, 冀璞光, 陶文明, 方峰

doi:10.16577/j.issn.1001-1560.2024.0003

材料保护 >

2024 , Vol. 57 >Issue 1: 14 - 20

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0003

研究篇

Ce对Zn-Al-Mg合金镀层组织和耐腐蚀性能的影响

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¹江苏亚盛金属制品有限公司； ²东南大学材料科学与工程学院

方峰(1976-)，博士，教授，研究方向为高性能金属材料，E-mail:fangfeng＠seu.edu.cn

收稿日期: 2023-03-28

修回日期: 2023-06-29

录用日期: 2023-07-20

网络出版日期: 2024-01-30

基金资助

国家自然科学基金资助项目(52171110)；江苏省先进金属材料高技术重点实验室课题(AMM2020A02)

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Effect of Ce on the Microstructure and Corrosion Resistance of Zn-Al-Mg Alloy Coatings

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(1.Jiangsu Yasheng Metal Products Co.，Ltd.，Taizhou 225700，China；2.School of Materials Science and Engineering，Southeast University，Nanjing 211189，China)

FANG Feng(1976-)，Ph.D.，Professor，Research Focus:High Performance Metal Material，E-mail:fangfeng＠seu.edu.cn

Received date: 2023-03-28

Revised date: 2023-06-29

Accepted date: 2023-07-20

Online published: 2024-01-30

Supported by

National Natural Science Foundation of China (52171110)；Key Laboratory of Advanced Metal Materials and High Technology in Jiangsu Province (AMM2020A02)

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摘要

为了考察Ce 含量对热浸镀Zn-Al-Mg 合金镀层的组织和耐腐蚀性能的影响，采用SEM、EDS、XRD 等方法对镀层的形貌、组织成分及物相进行了观察分析，结合盐雾试验对腐蚀产物形貌、组成及含量以及去除腐蚀产物后的镀层形貌进行了分析，并进一步通过电化学测试考察了不同镀层在3.5%NaCl 溶液中的电化学行为。结果表明，Zn-5Al-1.5Mg-xCe (x ＝0，0.05，0.10，0.25，质量分数，%) 合金镀层的组织由富Zn 相、富Al 相和Zn/Al/MgZn2(或Mg2Zn11)三元共晶组织组成，少量Ce 的加入增加了镀层中三元共晶组织的比例。Ce 可以减薄镀层，细化富Al 相，提高镀层的均匀性。当Ce 添加量为0.10%时，细化效果最好。另外，Zn-5Al-1.5Mg-0.10Ce 合金镀层的耐腐蚀性能最好，是Zn-5Al-1.5Mg 合金镀层的2.6 倍左右。Ce 提高了镀层的均匀性，减少了局部腐蚀，提高了Zn5(OH)8Cl2·H2O 腐蚀产物保护层的均匀性和致密性，从而提高了镀层的耐腐蚀性能。

关键词： Zn-Al-Mg-Ce 合金镀层; Ce 含量; 耐腐蚀性能; 微观组织

本文引用格式

蒋红兵, 李强, 徐巍, 田银宝, 冀璞光, 陶文明, 方峰 . Ce对Zn-Al-Mg合金镀层组织和耐腐蚀性能的影响[J]. 材料保护, 2024 , 57(1) : 14 -20 . DOI: 10.16577/j.issn.1001-1560.2024.0003

Abstract

For investigating the effect of Ce content on the structure and corrosion resistance of hot-dip Zn-Al-Mg alloy coatings，SEM，EDS，XRD and other methods were used to observe and analyze the morphology，structural composition and physical phase of the coating.Combined with the salt spray test，the morphology，composition and content of the corrosion products and the morphology of the coating after removing the corrosion products were analyzed，and the electrochemical behavior of different coatings in 3.5%NaCl solution was further evaluated through electrochemical tests.Results showed that the microstructure of Zn-5Al-1.5Mg-xCe (x＝0，0.05，0.10，0.25，mass fraction，the same below)alloy coating was composed of Zn-rich phase，Al-rich phase and Zn/Al/MgZn2(or Mg2Zn11) ternary eutectic structure.The small addition of Ce could increase the proportion of the ternary eutectic structure of the coating.Furthermore，Ce could thin the plating layer，refine the Al-rich phase，and improve the uniformity of the plating layer.When the dosage of Ce was 0.10%，the refinement effect was the best.In addition，the corrosion resistance of Zn-5Al-1.5Mg-0.10Ce alloy coating was the best，which was about 2.6 times that of Zn-5Al-1.5Mg alloy coating.Overall，Ce promoted the uniformity of the coating，reduced local corrosion，improved the uniformity and compactness of the protective layer of Zn5(OH)8Cl2·H2O corrosion products，and thus enhanced the corrosion resistance of the coating.

Key words： Zn-Al-Mg-Ce alloy coating; Ce content; corrosion resistance; microstructure

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