Influence of pH value on chromate-free conversion coating for magnesium alloys

翁文凭; 陈琦; 张慧; 钟皓; 闫蕴琪

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Influence of pH value on chromate-free conversion coating for magnesium alloys

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＜正＞Many factors were found to have effects on the conversion coatings for AZ31 alloy, alloy the most important one in producing high quality conversion coatings is found to be the control of the pH value. The influence of pH value on the conversion coating including color, thickness, adhesion and surface morphology was studied. The performance of conversion coating was examined by cross cut test, SEM method and salt immersion. The results show that the variation of pH value causes surface treatment process unstably. The conversion coating can obtain as pH value ranging from 3.0 to 5.0, while it presents dark, thick and bad adhesion under lower pH value. The conversion coatings have good combination of thickness and adhesion when pH value ranging from 4.0 to 4.5, and it exhibits a good corrosion resistance.

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《中国有色金属学报：英文版》 |2006年第s3期|1819-1822|共4页
作者
翁文凭; 陈琦; 张慧; 钟皓; 闫蕴琪;
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作者单位

Suzhou Institute for Nonferrous Metals Processing Technology Suzhou 215026;

China;

Suzhou Institute for Nonferrous Metals Processing Technology;

Suzhou 215026;

China;

Suzhou Institute for Nonferrous Metals Processing Technology;

Suzhou 215026;

China;

Suzhou Insti;

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原文格式 PDF
正文语种 chi
中图分类腐蚀的控制与防护;
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机译：镁合金;AZ31合金;转化膜;pH值;高锰酸盐;

Influence of pH value on chromate-free conversion coating for magnesium alloys

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