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Effects of electrolytes on properties of anodic coatings formed on AZ91HP magnesium alloy

Effects of electrolytes on properties of anodic coatings formed on AZ91HP magnesium alloy
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摘要 In a basic solution containing 10 g/L NaOH,the thickness,morphology and corrosion resistance of anodic coatings formed in solutions without and with additions of Na2SiO3,Na2CO3,Na2B4O7 and Na2SnO3 were separately determined and evaluated. The results show that the electrolytes used above take part in the coating formation and the obtained anodic coatings contain elements from the electrolytes. These electrolytes,especially Na2SiO3 and Na2B4O7,contribute to the film thickness. The coating uniformity obtained by addition of Na2SiO3 is the best,while Na2CO3,Na2B4O7 and Na2SnO3 decrease the number of pores per area on the coatings surface though they worsen the uniformity of the anodic coatings. In addition,the anodic coatings formed in solutions with addition of Na2CO3 or Na2SnO3 exhibit loose and net-like structure. Na2SiO3 and Na2B4O7 can significantly improve the corrosion resistance of the anodic coatings while Na2CO3 and Na2SnO3 have minor effects on improving the coating corrosion resistance. In a basic solution containing 10 g/L NaOH, the thickness, morphology and corrosion resistance of anodic coatings formed in solutions without and with additions of Na2SiO3, Na2CO3, Na2B4O7 and Na2SnO3 were separately determined and evaluated. The results show that the electrolytes used above take part in the coating formation and the obtained anodic coatings contain elements from the electrolytes. These electrolytes, especially Na2SiO3 and Na2B4OT, contribute to the film thickness. The coating uniformity obtained by addition of Na2SiO3 is the best, while Na2CO3, Na2B4O7 and Na2SnO3 decrease the number of pores per area on the coatings surface though they worsen the uniformity of the anodic coatings. In addition, the anodic coatings formed in solutions with addition of Na2CO3 or Na2SnO3 exhibit loose and net-like structure. Na2SiO3 and Na2B4O7 can significantly improve the corrosion resistance of the anodic coatings while Na2CO3 and Na2SnO3 have minor effects on improving the coating corrosion resistance.
作者 张淑芳 王方圆 张荣发 李明升 赵芳 周冲 胡长员
机构地区 Jiangxi Key Laboratory of Surface Engineering Jinhua College of Profession and Technology College of Material Science and Engineering
出处 《中国有色金属学会会刊：英文版》 CSCD 2007年第A02期785-788,共4页 Transactions of Nonferrous Metals Society of China
基金 Project (0650034) supported by the Natural Science Foundation of Jiangxi Province, China
关键词 镁合金 阳极涂层 电解 电镀 magnesium alloy anodic coatings electrolyte effect
分类号 TG174.4 [金属学及工艺—金属表面处理]
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参考文献18

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中国有色金属学会会刊：英文版
2007年 第A02期

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