Effect of Current Density on Microstructure and Corrosion Behavior of Plasma Electrolytic Oxidation Coated 6063 Aluminum Alloy
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2018年第6期
论文作者：庄俊杰 宋仁国 ZHENG Chuanbo
文章页码：1503 - 1510
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/dm2 on 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-Al2 O3 and γ-Al2 O3. Potentiodynamic polarization test proves that the coating formed under 10 A/dm2 possesses the best anticorrosion property. The long time EIS test shows that the coating under 10 A/dm2 is 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.
庄俊杰1,2,3，宋仁国1,2,3，ZHENG Chuanbo4
1. School of Materials Science and Engineering, Changzhou University2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University3. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University4. School of Materials Science and Engineering, Jiangsu University of Science and Technology
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/dm2 on 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-Al2 O3 and γ-Al2 O3. Potentiodynamic polarization test proves that the coating formed under 10 A/dm2 possesses the best anticorrosion property. The long time EIS test shows that the coating under 10 A/dm2 is 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.
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