Effect of Various Additives on Performance of Plasma Electrolytic Oxidation Coatings Formed on AZ31 Magnesium Alloy in the Phosphate Electrolytes

被引：0
作者：
Junjie Zhuang
Renguo Song
Hongxia Li
Nan Xiang
机构：
[1] Changzhou University,School of Materials Science and Engineering
[2] Changzhou University,Jiangsu Key Laboratory of Materials Surface Science and Technology
[3] Changzhou University,Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering
[4] Hangzhou Dianzi University,College of Materials and Environmental Engineering
来源：
Journal of Wuhan University of Technology-Mater. Sci. Ed. | 2018年 / 33卷
关键词：
magnesium alloy; plasma electrolytic oxidation; additives; microstructure; corrosion resistance;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Plasma electrolytic oxidation (PEO) coatings were prepared on AZ31 magnesium alloy using alkaline phosphate as base electrolyte system, and with the addition of sodium silicate (Na2SiO3), sodium aluminate (NaAlO2) and potassium fluorozirconate (K2ZrF6) as additives. The microstructure, phase composition and element composition as well as surface profile of the PEO coatings were analyzed by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and threedimensional (3D) optical profilometry. The corrosion and wear properties were evaluated by electrochemical potentiodynamic polarization in 3.5 wt% NaCl solution and ball-on-disc wear tests, respectively. The results showed that the anions of the additives effectively participated in the coating formation influencing its microstructural features, chemical composition, corrosion resistance and tribological behaviour. It was observed that the sample treated by PEO in the electrolyte solution containing K2ZrF6 as an additive showed better corrosion and abrasive resistance.
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页码：703 / 709
页数：6
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