稀土氧化钇对AZ31B镁合金微弧氧化膜层微观组织和性能的影响

李鑫, 张晟豪, 王子恒, 郭豫鹏, 陆晓峰

doi:10.16577/j.issn.1001-1560.2022.0273

材料保护 >

2022 , Vol. 55 >Issue 10: 37 - 42

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0273

试验研究

稀土氧化钇对AZ31B镁合金微弧氧化膜层微观组织和性能的影响

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(南京工业大学机械与动力工程学院，江苏南京 211816)

郭豫鹏，博士，讲师，研究方向为微弧氧化电源及工艺，电话：13914462801，E-mail：guoyupeng685918@163.com

收稿日期: 2021-08-24

修回日期: 2022-09-13

录用日期: 2022-09-28

网络出版日期: 2023-12-23

基金资助

大学生创新创业项目(202010291206Y)；南京工业大学引进人才科研启动费项目(3827400212)资助

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Effect of Rare Earth Y2O3 on the Microstructure and Properties of AZ31B Magnesium Alloy Coatings Prepared by Micro - Arc Oxidation

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(School of Mechanical and Power Engineering,Nanjing Tech University,Nanjing 211816,China)

Received date: 2021-08-24

Revised date: 2022-09-13

Accepted date: 2022-09-28

Online published: 2023-12-23

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摘要

为提高镁合金表面的耐腐蚀性能，采用微弧氧化技术在AZ31B镁合金上制备了稀土Y2O3/MgO复合陶瓷膜层，提高了基体的硬度和耐腐蚀性能。稀土纳米Y2O3的加入提高了电解液的电导率，相同处理时间处理电压逐渐升高。扫描电镜(SEM)结果表明微孔数量随Y2O3浓度增加逐渐减少，微孔直径逐渐减小，孔隙率逐渐降低。X射线衍射(XRD)检测结果表明，膜层主要由MgO和Y2O3组成。膜层中Y2O3含量随着电解液中Y2O3浓度的增加逐渐增加。随着Y2O3含量从0 g/L增加到4 g/L，膜层的表面粗糙度从1.85 μm下降到1.48 μm，膜层厚度从52.33 μm增加到58.37 μm。在Y2O3浓度为3 g/L时，表面硬度提高到365.6 HV4.9 N，腐蚀电流降低到2.872×10-3A。

关键词： 微弧氧化; AZ31B镁合金; 稀土氧化钇; 复合膜层; 耐腐蚀性能

本文引用格式

李鑫, 张晟豪, 王子恒, 郭豫鹏, 陆晓峰 . 稀土氧化钇对AZ31B镁合金微弧氧化膜层微观组织和性能的影响[J]. 材料保护, 2022 , 55(10) : 37 -42 . DOI: 10.16577/j.issn.1001-1560.2022.0273

Abstract

Aiming at improving the corrosion resistance of magnesium alloy surface,rare earth Y2O3/MgO ceramic coatings were prepared on AZ31B magnesium alloy via micro-arc oxidation.The hardness and corrosion resistance of the substrate increased.The addition of nano Y2O3 raised the conductivity of the electrolyte,and the voltage at the same treatment time increased.The scanning electron microscopy (SEM) results showed that,the number of “crater”holes,the diameter of micro pores and the porosity decreased with the increase of Y2O3 concentration.X-ray diffraction results indicated that the coatings were mainly consisted of MgO and Y2O3,and the Y2O3 content in the coatings increased with the increase of Y2O3 concentration in electrolyte.Moreover,as the Y2O3 concentration increased from 0 g/L to 4 g/L,the surface roughness of the coating declined from 1.85 μm to 1.48 μm,and the thickness was improved from 52.33 μm to 58.37 μm.When the Y2O3 concentration was 3 g/L,the surface hardness of the as-obtained coating increased to 365.6 HV4.9 N,and the corrosion current decreased to 2.872×10-3 A.

Key words： micro-arc oxidation; AZ31B magnesium alloy; rare earth yttrium oxide; composite coating; corrosion resistance

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