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

JIANG Hongbing, LI Qiang, XU Wei, TIAN Yinbao, JI Puguang, TAO Wenming, FANG Feng

doi:10.16577/j.issn.1001-1560.2024.0003

Materials Protection >

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

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

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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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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JIANG Hongbing, LI Qiang, XU Wei, TIAN Yinbao, JI Puguang, TAO Wenming, FANG Feng . Effect of Ce on the Microstructure and Corrosion Resistance of Zn-Al-Mg Alloy Coatings[J]. Materials Protection, 2024 , 57(1) : 14 -20 . DOI: 10.16577/j.issn.1001-1560.2024.0003

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