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Sr元素含量对Zn-2.0%Al-1.2%Mg镀层的微观组织与耐蚀性的影响

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  • 1株洲冶炼集团股份有限公司; 2湘潭大学机械工程与力学学院

刘 洋(1985-),教授,博士生导师,主要从事新型高性能有色金属制备、成形与强化机理研究,E-mail: liuyang_225@126.com;

朱戴博(1988-),博士,硕士生导师,主要从事有色金属材料设计及塑性加工技术与理论研究,E-mail:Daibozhu@xtu.etu.cn

收稿日期: 2024-01-22

  修回日期: 2024-02-15

  录用日期: 2024-02-17

  网络出版日期: 2024-11-14

Effect of Sr Element Content on the Microstructure and Corrosion Resistance of Zn-2%Al-1.2%Mg Coating

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  • (1.Zhuzhou Smelter Group Co., Ltd., Zhuzhou 412000, China;2.School of Mechanical Engineering and Mechanics, Xiangtan University, Xiangtan 411110, China)

LIU Yang (1985-), Professor, Ph.D.Supervisor, Research Focus: Preparation, Forming and Strengthening Mechanism of New High-Performance Non-Ferrous Metals, E-mail: liuyang_225@126.com;

ZHU Daibo (1988-), Ph.D., Master’s Supervisor, Research Focus: Non-Ferrous Metal Material Design, Plastic Processing Technology and Theory Research, E-mail: Daibozhu@xtu.etu.cn

Received date: 2024-01-22

  Revised date: 2024-02-15

  Accepted date: 2024-02-17

  Online published: 2024-11-14

摘要

为了进一步研究微量合金元素对镀层微观组织的调控以及耐蚀性能的影响机理,采用双镀法在Q235钢板上制备Zn-2.0%Al-1.2%Mg-x%Sr(x =0、0.03%、0.06%、0.09%、0.12%,质量分数)镀层,通过扫描电子显微镜(SEM)、X 射线衍射仪(XRD)、5%NaCl 浸泡实验等方法探究Sr 元素含量对Zn-2.0%Al-1.2%Mg 镀层的微观组织与耐蚀性的影响。 结果表明:添加适量的Sr 元素,可以有效细化Zn-2.0%Al-1.2%Mg 镀层表面凝固组织中的初生η-Zn 相,引导生成Zn/Al/MgZn2三元共晶组织,使中间合金层中FeAl3-Znx柱状晶变得更加致密。 当Sr 的添加量为0.09%时,镀层表面凝固组织的细化效果最为明显,中间合金层最薄且致密,此时镀层的浸泡腐蚀速率最低,耐蚀性最好。

本文引用格式

林文军, 欧阳志云, 占杨方, 苗华磊, 刘洋, 朱戴博 . Sr元素含量对Zn-2.0%Al-1.2%Mg镀层的微观组织与耐蚀性的影响[J]. 材料保护, 2024 , 57(9) : 28 -35 . DOI: 10.16577/j.issn.1001-1560.2024.0198

Abstract

In order to further investigate the regulation of trace alloying elements on the microstructure of coatings and the mechanism of their influence on corrosion resistance, a dual plating method was used to prepare Zn-2.0%Al-1.2%Mg-x%Sr (x =0, 0.03%, 0.06%, 0.09%,0.12%, mass fraction) coatings on Q235 steel plates.The effects of Sr element content on the microstructure and corrosion resistance of Zn-2.0%Al-1.2%Mg coatings were examined through scanning electron microscopy (SEM), X - ray diffraction (XRD) and 5%NaCl immersion test.Results showed that adding an appropriate amount of Sr element could effectively refine the primary η-Zn phase in the solidification microstructure of the surface of Zn-2.0%Al-1.2%Mg coating, promoted the formation of a Zn/Al/MgZn2 ternary eutectic structure, and made the FeAl3-Znx columnar crystals in the intermediate alloy layer denser.Notably, when the addition amount of Sr was 0.09%, the refinement effect of solidification structure on the surface of the coating was most obvious, and the intermediate alloy layer was the thinnest and densest, at which time the coating had the lowest rate of immersion corrosion and the best corrosion resistance.    
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