Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy
镁合金自密封等离子电解氧化膜的制备及性能作者机构：Guangxi Key Laboratory of Electrochemical and Magnetochemical Function MaterialsCollege of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China
出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)
年 卷 期：2023年第30卷第5期
页 面：959-969页
核心收录：
学科分类：080503[工学-材料加工工程] 08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学]
基 金：financially supported by the Guangxi Natural Science Foundation(No.2020GXNSFAA159011) the National Natural Science Foundation of China(No.51664011)。
主 题：magnesium alloy in-situ sealing plasma electrolytic oxidation corrosion resistance
摘 要：Plasma electrochemical oxidation (PEO) is a surface modification technology to form ceramic coatings on magnesium alloys However,its application is limited due to its defects.This work reports a novel preparation of in-situ sealing of PEO coatings by four-layer voltage and sol addition.The morphology and structure were characterized by scanning electron microscopy (SEM),energy dispersive X-ray spectroscopy (EDS),and X-ray diffractometer (XRD).Image-Pro Plus 6.0 was used to determine the porosity of the coating,which was decreased from 8.53%to 0.51%.Simultaneously,the coating thickness was increased by a factor of four.The anti-corrosion performance of each sample was evaluated using electrochemical tests,and the findings revealed that the corrosion current density of coatings (i_(corr)) of the samples were lowered from 9.152×10^(-2) to 6.152×10^(-4) mA·cm^(-2),and the total resistance (R_(T)) of the samples were enhanced from 2.19×10^(4) to 2.33×10^(5)Ω·cm^(2).The salt spray test used to simulate the actual environment showed that corrosion points appeared on the surface of the coating only at the 336 h.In addition,the mechanism of PEO self-sealing behavior was described in this article.
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