Effects of current density on microstructure and properties of plasma electrolytic oxidation ceramic coatings formed on 6063 aluminum alloy

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• 作者：Nan XIANG^a ; ^b ; Ren-guo SONG^a ; ^b ; ^c ; ^{songrg@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Jun-jie ZHUANG^a ; ^b ; Ruo-xi SONG^c ; Xiao-ya LU^a ; ^b ; Xu-ping SU^a ; ^b
• 关键词：6063 aluminum alloy ; ceramic coating ; plasma electrolytic oxidation (PEO) ; current density ; microstructure ; mechanical property
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：26
• 期：3
• 页码：806-813
• 全文大小：2987 K

文摘

Plasma electrolytic oxidation (PEO) ceramic coatings were fabricated in a silicate-based electrolyte with the addition of potassium fluorozirconate (K₂ZrF₆) on 6063 aluminum alloy, and the effects of current density on microstructure and properties of the PEO coatings were studied. It was found that pore density of the coatings decreased with increasing the current density. The tribological and hardness tests suggested that the ceramic coating produced under the current density of 15 A/dm² showed the best mechanical property, which matched well with the phase analysis. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves proved that the coating obtained under 15 A/dm² displayed the best anti-corrosion property, which was directly connected with morphologies of coatings.