镁合金AZ31B在含Al₂O₃溶胶添加剂电解液中的等离子体电解氧化

Plasma Electrolytic Oxidation of Magnesium Alloy AZ31B in Electrolyte Containing Al₂O₃ Sol as Additives.

作者信息

Tu Xiaohua, Miao Chengping, Zhang Yang, Xu Yaling, Li Jiayou

机构信息

College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, China.

出版信息

Materials (Basel). 2018 Sep 5;11(9):1618. doi: 10.3390/ma11091618.

DOI:10.3390/ma11091618

PMID:30189616

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6165427/

Abstract

Plasma electrolytic oxidation (PEO) coatings were produced on AZ31B magnesium alloys in alkaline electrolytes with the addition of various concentrations of Al₂O₃ sols. Effects of Al₂O₃ sol concentrations on the microstructure, phase composition, corrosion resistance and hardness of PEO coatings were evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness testing and potentiodynamic polarization measurements, respectively. It was revealed that the Al₂O₃ sol mostly participated in the formation of the ceramic coating and transferred into the MgAl₂O₄ phase. With the increase of the Al₂O₃ sol concentration in the range of 0⁻6 vol%, the coating performance in terms of the microstructure, diffraction peak intensity of the MgAl₂O₄ phase, corrosion resistance and microhardness was improved. Further increase of Al₂O₃ sol addition did not generate better results. This indicated that 6 vol% might be the proper Al₂O₃ sol concentration for the formation of PEO coatings.

摘要

在添加了不同浓度Al₂O₃溶胶的碱性电解液中，在AZ31B镁合金上制备了等离子体电解氧化（PEO）涂层。分别通过扫描电子显微镜（SEM）、X射线衍射（XRD）、显微硬度测试和动电位极化测量，评估了Al₂O₃溶胶浓度对PEO涂层微观结构、相组成、耐腐蚀性和硬度的影响。结果表明，Al₂O₃溶胶主要参与陶瓷涂层的形成并转化为MgAl₂O₄相。在0⁻6 vol%范围内，随着Al₂O₃溶胶浓度的增加，涂层在微观结构、MgAl₂O₄相衍射峰强度、耐腐蚀性和显微硬度方面的性能得到改善。进一步增加Al₂O₃溶胶的添加量并没有产生更好的效果。这表明6 vol%可能是形成PEO涂层合适的Al₂O₃溶胶浓度。