固溶时效处理对Mg-4Sm-3Gd-0.5Zr合金显微组织和耐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2022.04.002

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 10-16.DOI: 10.13251/j.issn.0254-6051.2022.04.002

固溶时效处理对Mg-4Sm-3Gd-0.5Zr合金显微组织和耐蚀性能的影响

张子延¹, 陈君^1,2, 陈晓亚^1,2, 李全安^1,2, 刘建鑫¹

1.河南科技大学材料科学与工程学院, 河南洛阳 471023;
2.有色金属新材料与先进加工技术省部共建协同创新中心, 河南洛阳 471023

收稿日期:2021-10-20 修回日期:2022-01-07 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 陈君,高级实验师,硕士生导师,博士, E-mail:chenjun318822200@163.com
作者简介:张子延(1997—),男,硕士研究生,主要研究方向为先进镁合金,E-mail:553084699@qq.com。
基金资助:
国家自然科学基金(51571084)

Effect of solution and aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy

Zhang Ziyan¹, Chen Jun^1,2, Chen Xiaoya^1,2, Li Quan'an^1,2, Liu Jianxin¹

1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang Henan 471023, China;
2. Provincial and Ministerial Co-construction of Collaborative Innovation Center for Nonferrous Metal New Materials and Advanced Processing Technology, Luoyang Henan 471023, China

Received:2021-10-20 Revised:2022-01-07 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 利用光学显微镜、X射线衍射仪和扫描电镜等方法研究了固溶时效处理前后Mg-4Sm-3Gd-0.5Zr合金(质量分数,%)的显微组织、物相组成和腐蚀形貌,并在质量分数为3.5%的NaCl溶液中进行了静态失重和电化学测试。结果表明,铸态Mg-4Sm-3Gd-0.5Zr合金由α-Mg基体和沿晶界分布的粗大网状共晶相Mg₄₁Sm₅和Mg₅Gd组成,固溶时效处理并没有改变共晶相的种类,但网状共晶组织消失,并且晶内有大量细小弥散的第二相析出,晶界更加清晰。试验合金采用525 ℃×8 h固溶+225 ℃×8 h时效处理后,腐蚀速率从0.185 mg·cm^-2·h^-1降低至到0.116 mg·cm^-2·h^-1,自腐蚀电流密度从1.599×10^-4A·cm^-2降低到0.924×10^-4 A·cm^-2,耐蚀性能明显提高。

关键词: Mg-4Sm-3Gd-0.5Zr合金, 固溶时效, 显微组织, 耐蚀性能

Abstract: Microstructure, phase composition and corrosion morphology of Mg-4Sm-3Gd-0.5Zr (mass fraction, %) alloy before and after solution and aging treatment were studied by means of optical microscope, X-ray diffractometer and scanning electron microscope, and the static weight loss experiment and electrochemical test were carried out in NaCl solution with mass fraction of 3.5%. The results show that the as-cast Mg-4Sm-3Gd-0.5Zr alloy is composed of α-Mg matrix and coarse network eutectic phases Mg₄₁Sm₅ and Mg₅Gd distributed along grain boundaries. After solution and aging treatment, the type of eutectic phases is not changed, but the network eutectic microstructure disappears, a large number of fine and dispersed second phases are precipitated in the grain and the grain boundaries are clearer. After solution treated at 525 ℃ for 8 h and aged at 225 ℃ for 8 h, the corrosion rate of the alloy decreases from 0.185 mg·cm^-2·h^-1 to 0.116 mg·cm^-2·h^-1, and the corrosion current density decreases from 1.599×10^-4 A·cm^-2 to 0.924×10^-4 A·cm^-2, at which the corrosion resistance is significantly improved.

Key words: Mg-4Sm-3Gd-0.5Zr alloy, solution and aging, microstructure, corrosion resistance

中图分类号:

TG156

张子延, 陈君, 陈晓亚, 李全安, 刘建鑫. 固溶时效处理对Mg-4Sm-3Gd-0.5Zr合金显微组织和耐蚀性能的影响[J]. 金属热处理, 2022, 47(4): 10-16.

Zhang Ziyan, Chen Jun, Chen Xiaoya, Li Quan'an, Liu Jianxin. Effect of solution and aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy[J]. Heat Treatment of Metals, 2022, 47(4): 10-16.

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固溶时效处理对Mg-4Sm-3Gd-0.5Zr合金显微组织和耐蚀性能的影响

Effect of solution and aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy

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