Effect of Current Density on Microstructure and Corrosion Behavior of Plasma Electrolytic Oxidation Coated 6063 Aluminum Alloy

作     者：ZHUANG Junjie SONG Renguo 庄俊杰;宋仁国;ZHENG Chuanbo

作者机构：School of Materials Science and Engineering Changzhou University Jiangsu Key Laboratory of Materials Surface Science and Technology Changzhou University Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering Changzhou University School of Materials Science and Engineering Jiangsu University of Science and Technology 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2018年第33卷第6期

页      面：1503-1510页

核心收录：

学科分类：08[工学] 

基　　金：Funded by the National Natural Science Foundation of China(Nos.51371039 and 51871031) 

主　　题：coating 6063 aluminum alloy plasma electrolytic oxidation (PEO) current density corrosion resistance 

摘      要：Plasma electrolytic oxidation(PEO) coatings were fabricated on 6063 aluminum alloy in a cheap and convenient electrolyte. The effect of different current densities, i e, 5, 10, 15, and 20 A/dm2on the microstructure and corrosion behavior of coatings was comprehensively studied by scanning electron microscopy(SEM), stereoscopic microscopy, potentiodynamic polarization and electrochemical impedance spectroscopy(EIS), respectively. It is found that the pore density decreases and the pore size increases with increasing current density. The XRD results show that the coatings are only composed of α-Al2O3and γ-Al2O3. Potentiodynamic polarization test proves that the coating formed under 10 A/dm2possesses the best anticorrosion property. The long time EIS test shows that the coating under 10 A/dm2is able to protect the aluminum alloy substrate after long time of immersion in 0.59 M NaCl solution, which confirms the salt solution immersion test results in 2 M NaCl solution.