激光表面合金化处理对AZ91D组织与耐蚀性能的影响

石雪梅, 刘帅, 樊巧芳, 杨铁军, 郭凤平, 丛丹, 杨益民

doi:10.16577/j.issn.1001-1560.2022.0150

材料保护 >

2022 , Vol. 55 >Issue 6: 28 - 33

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0150

试验研究

激光表面合金化处理对AZ91D组织与耐蚀性能的影响

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1. 辽河油田培训中心机电工程培训部； 2. 辽河油田兴隆台采油厂； 3. 江苏安全技术职业学院

石雪梅(1985-)，硕士，讲师，主要从事激光、新材料连接技术方面的研究，电话：13998740865， E - mail：24109588@qq.com

收稿日期: 2021-12-30

修回日期: 2021-01-29

录用日期: 2022-02-28

网络出版日期: 2024-01-09

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Effects of Laser Surface Alloying on the Microstructure and Corrosion Resistance of AZ91D

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1. Electromechanical Engineering Training Department, Liaohe Oilfield Training Center, Panjin 124010, China;2. Xinglongtai Plant, Liaohe Oilfield Company, Panjin 124010, China; 3. Jiangsu College of Safety Technology, Xuzhou 221011, China

Received date: 2021-12-30

Revised date: 2021-01-29

Accepted date: 2022-02-28

Online published: 2024-01-09

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摘要

镁合金的耐蚀性较差，因此进行适当的表面改性处理以提高其耐蚀性成为目前研究的热点。在AZ91D镁合金表面预置Al粉并进行激光合金化处理，对比分析了合金化层组织和基体组织，测试了镁合金基体及合金化层的耐蚀性。结果表明：激光合金化区灰白色基体是由小部分α - Mg和较多的β - Mg17Al12组成，暗黑色点状组织是α - Mg+β - Mg17Al12，针叶状组织是α - Mg。激光合金化工艺使合金化区中α - Mg晶粒细化，铝元素的偏析程度降低，β - Mg17Al12的含量显著增多，从而使镁合金表面的耐蚀性大幅度提升。

关键词： 镁合金; 激光合金化; 组织; 腐蚀

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石雪梅, 刘帅, 樊巧芳, 杨铁军, 郭凤平, 丛丹, 杨益民 . 激光表面合金化处理对AZ91D组织与耐蚀性能的影响[J]. 材料保护, 2022 , 55(6) : 28 -33 . DOI: 10.16577/j.issn.1001-1560.2022.0150

Abstract

Owing to the poor corrosion resistance of magnesium alloys, applying proper surface modification treatment to improve their corrosion resistance has become a hot point of current research. In this work, Al powders were pre - placed on the surface of AZ91D magnesium alloy and further treated by laser alloying. The microstructures of the alloyed layer and the substrate were compared and analyzed, and the corrosion resistances of the magnesium alloy and the alloyed layer were tested. Results showed that the gray - white matrix in the laser alloyed area was composed of a small part of α - Mg and a large amount of β - Mg17Al12, the dark black dotted structure was α - Mg+β - Mg17Al12, and the coniferous structure was α - Mg. In all, the laser alloying process refined the α - Mg grains in the alloyed area, reduced the segregation degree of aluminum element, and significantly increased the content of β - Mg17Al12, and therefore greatly improved the corrosion resistance of the magnesium alloy surface.

Key words： magnesium alloy; laser alloying; microstructure; corrosion

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