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

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...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2010-07, Vol.20 (B07), p.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: Article
Language:English
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
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Summary: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.
ISSN:1003-6326
DOI:10.1016/S1003-6326(10)60557-2