Effects of electric parameters on corrosion resistance of anodic coatings formed on magnesium alloys

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. B07; pp. 660 - 664
• Main Author: 张淑芳 胡光辉 张荣发 贾志翔 王丽君 王义君 胡长员 何向明
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2010; Jiangxi Key Laboratory of Surface Engineering,Jiangxi Science and Technology Normal University,Nanchang 330013,China; School of Materials Science and Engineering,Jiangxi Science and Technology Normal University,Nanchang 330013,China%School of Electronics,Jiangxi University of Finance and Economics,Nanchang 330013,China%School of Materials Science and Engineering,Jiangxi Science and Technology Normal University,Nanchang 330013,China
• Subjects: Anodic coatings; Coating; Corrosion resistance; electric parameters; Electric potential; magnesium alloys; Magnesium base alloys; micro-arc oxidation; Phytic acid; Protective coatings; Voltage; 涂层厚度; 电压频率; 电参数; 电流密度; 终止电压; 耐腐蚀性能; 镁合金; 阳极氧化膜; magnesium alloys; micro-arc oxidation; electric parameters; corrosion resistance
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(10)60557-2

Anodic coatings were obtained by micro-arc oxidation on AZ91HP magnesium alloys in a solution containing 10 g/L NaOH and 8 g/L phytic acid.The effects of electric parameters including frequency,final voltage,duty cycle and current density on the corrosion resistance of anodic coatings formed on the magnesium alloys were investigated by using an orthogonal experiment of four factors with three levels.The results show that the final voltage plays a main role on the coating properties.The orders of affecting corrosion resistance and coating thickness are separately ranked from high to low as,final voltage〉duty cycle〉current density〉frequency and final voltage〉current density〉frequency〉duty cycle.The final voltage influences the corrosion resistance of the anodized samples mainly by changing the surface morphology and coating thickness.