固溶处理对Mg-1Zn-1Ca合金组织和耐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2023.09.008

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 48-53.DOI: 10.13251/j.issn.0254-6051.2023.09.008

固溶处理对Mg-1Zn-1Ca合金组织和耐蚀性能的影响

王建¹, 宋蕾¹, 王艺卓², 张全福¹, 任乃栋¹, 武维康¹, 王红霞², 罗小萍³

1.孝义市东义镁业有限公司, 山西孝义 032308;
2.太原理工大学材料科学与工程学院, 山西太原 030024;
3.太原科技大学材料科学与工程学院, 山西太原 030024

收稿日期:2023-04-17 修回日期:2023-07-11 出版日期:2023-09-25 发布日期:2023-10-25
通讯作者: 罗小萍,教授级高工,E-mail:lxpsyx@126.com
作者简介:王建(1988—),男,主要研究方向为镁合金制备与性能,E-mail:wangjian2350@163.com。
基金资助:
山西省科技成果转化引导专项(202104021301022, 202204021301009);山西省自然科学基金(20210302123135, 20210302123163);中央引导地方科技发展资金项目(YDZJSX20231B003);山西省科技重大专项(20191102008, 20191102007)

Effect of solution treatment on microstructure and corrosion resistance of Mg-1Zn-1Ca alloy

Wang Jian¹, Song Lei¹, Wang Yizhuo², Zhang Quanfu¹, Ren Naidong¹, Wu Weikang¹, Wang Hongxia², Luo Xiaoping³

1. Xiaoyi Dongyi Magnesium Industry Co., Ltd., Xiaoyi Shanxi 032308, China;
2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
3. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024, China

Received:2023-04-17 Revised:2023-07-11 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 通过OM、SEM、EDS及XRD等方法研究了铸态Mg-1Zn-1Ca合金固溶处理后的显微组织演变,通过电化学试验和浸泡试验探究了固溶处理对铸态Mg-1Zn-1Ca合金耐蚀性能的影响。结果表明,铸态Mg-1Zn-1Ca合金由Mg基体、Ca₂Mg₆Zn₃相及Mg₂Ca相组成,固溶处理后,基体晶粒随着固溶温度升高(400、420、440 ℃)逐渐长大,Ca₂Mg₆Zn₃相发生了回溶,第二相数量逐渐减少,合金腐蚀速率先降低后升高,合金在固溶420 ℃×8 h后耐蚀性能最好,平均腐蚀速率最低,仅为0.7725±0.016 mm/y,其耐蚀性能的提升归因于第二相回溶,电偶腐蚀效应减弱。合金在固溶440 ℃×8 h后因为晶粒粗化加剧了局部腐蚀,耐蚀性能发生了恶化。

关键词: Mg-1Zn-1Ca合金, 固溶处理, 第二相, 耐蚀性能

Abstract: Microstructure evolution of as-cast Mg-1Zn-1Ca alloy after solution treatment was studied by means of OM, SEM, EDS and XRD, and the effect of solution treatment on the corrosion resistance of the alloy was explored by electrochemical experiments and immersion experiments. The results show that the as-cast Mg-1Zn-1Ca alloy is composed of Mg matrix, Ca₂Mg₆Zn₃ phase and Mg₂Ca phase, while after solution treatment, the matrix grains gradually grow with the increase of solution temperature (400, 420, 440 ℃), the Ca₂Mg₆Zn₃ phase redissolves, the amount of second phases gradually decreases, the corrosion rate of the alloy first decreases and then increases. The alloy has the best corrosion resistance after solution treatment at 420 ℃ for 8 h, with the lowest average corrosion rate of 0.7725±0.016 mm/y. The improvement of corrosion resistance is attributed to the second phase redissolution, and the galvanic corrosion effect is weakened. While for the alloy after solution treatment at 440 ℃ for 8 h, the corrosion resistance deteriorates because the grain coarsening intensifies the local corrosion.

Key words: Mg-1Zn-1Ca alloy, solution treatment, second phase, corrosion resistance

中图分类号:

王建, 宋蕾, 王艺卓, 张全福, 任乃栋, 武维康, 王红霞, 罗小萍. 固溶处理对Mg-1Zn-1Ca合金组织和耐蚀性能的影响[J]. 金属热处理, 2023, 48(9): 48-53.

Wang Jian, Song Lei, Wang Yizhuo, Zhang Quanfu, Ren Naidong, Wu Weikang, Wang Hongxia, Luo Xiaoping. Effect of solution treatment on microstructure and corrosion resistance of Mg-1Zn-1Ca alloy[J]. Heat Treatment of Metals, 2023, 48(9): 48-53.

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固溶处理对Mg-1Zn-1Ca合金组织和耐蚀性能的影响

Effect of solution treatment on microstructure and corrosion resistance of Mg-1Zn-1Ca alloy

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