AZ31镁合金的SiO<sub>2</sub>（Mg）涂层的组织及性能研究

代卫丽; 宋月红; 刘彦峰; 路遇; 王瑾; 刘凡

AZ31镁合金的SiO₂（Mg）涂层的组织及性能研究

代卫丽^1,2,
宋月红^1,2,
刘彦峰^1,2,
路遇¹,
王瑾¹,
刘凡¹

1. 商洛学院陕西省尾矿资源综合利用重点实验室, 陕西商洛 726000;
2. 商洛学院陕西省矿产资源清洁高效转化与新材料工程研究中心, 陕西商洛 726000

基金项目:

陕西省自然科学基础研究计划资助项目（2019JQ-156）；陕西省教育厅重点科研计划项目（20JS039）；陕西省教育厅重点科研计划项目（19JS026）；商洛学院博士科研项目（17SKY019和17SKY018）；商洛市高性能有色金属制备与加工技术创新团队（SK2019-75）

详细信息

作者简介:
代卫丽,女,1981年生,博士,讲师,研究方向为有色金属的制备与开发。E-mail:dweili@126.com

中图分类号: TG174.4
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出版历程
- 收稿日期: 2021-03-18
- 刊出日期: 2021-10-25

Microstructure and Performance Study on Si0₂(Mg) Coating on AZ31 Magnesium Alloy

1. Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo 726000, China;
2. Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversion and New Materials, Shangluo University, Shangluo 726000, China

摘要

摘要: 采用机械合金化的方法在AZ31镁合金表面涂覆SiO₂（Mg）涂层。通过XRD、显微硬度计、扫描电镜等测试手段对表面涂层的微观形貌结构、涂层的显微硬度进行分析，利用电化学工作站对涂覆前后的AZ31镁合金的耐蚀性能进行检测。结果表明：SiO₂涂层被成功地涂覆到AZ31镁合金表面；同时，随着球磨时间的增加，涂层的显微硬度呈增加趋势，且随着球料比的增加，显微硬度亦增加，最高达到370.6HV，较基体提高了15.2%；涂层的厚度也呈现先增加后趋于稳定的趋势，但球磨时间过长，涂层内部出现裂纹；当球料比为15：1、球磨时间为15 h时，所制备涂层厚度为148μm，涂层致密且与基体结合较好；所对应的自腐蚀电流密度较基体降低了一个数量级，对应的腐蚀电压提高了6.5%，耐腐蚀性能得到明显改善。
- AZ31镁合金 /
- 耐腐蚀性 /
- 机械合金化 /
- 涂层
Abstract: SiO₂(Mg) coating was applied on the surface of AZ31 magnesium alloy by mechanical alloying. The microstructure and microhardness of the surface coating were analyzed by XRD, microhardness tester and scanning electron microscope. The corrosion resistance of AZ31 magnesium alloy before and after being coated was tested by electrochemical workstation. The results showed that SiO₂ was successfully coated on the surface of AZ31 magnesium alloy. At the same time, with the increase of milling time and ball-to-material ratio, the microhardness increased, which could be up to 370.6 HV, 15.2% higher than that of the substrate. The thickness of the coating also showed a trend of increasing first and then stabilizing. However, if the ball milling time was too long, cracks would appear in the coating. When the ball-to-material ratio was 15:1 and the ball milling time was 15 h, the thickness of the prepared coating was 148 μm, the coating compact and the bond between the film and substrate excellent. The corresponding self-corrosion current density was reduced by 1 magnitude and the corresponding corrosion current increased by 6.5% compared with those of the substrate. The corrosion resistance was obviously improved.
- AZ31 magnesium alloy /
- corrosion resistance /
- mechanical alloying /
- coating

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