| Influence of pH value on chromate-free conversion coating for magnesium alloys |
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| 引用本文： | 翁文凭 陈琦 张慧 钟皓 闫蕴琪. Influence of pH value on chromate-free conversion coating for magnesium alloys[J]. 中国有色金属学会会刊, 2006, 16(A03): 1819-1822 |
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| 作者姓名： | 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 |
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| 基金项目： | Foundation item： Project（BK2006543） supported by the Nature Science Foundation of Jiangsu Province, China; project （2005KJAI3） supported by the CHALC0 S＆T Foundation |
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| 摘 要： |
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| 关 键 词： | 铬酸盐 镁合金 涂层 微观结构 |
| 收稿时间： | 2006-07-28 |
| 修稿时间： | 2006-09-15 |
Influence of pH value on chromate-free conversion coating for magnesium alloys |
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| WENG Wen-ping, CHEN Qi, ZHANG Hui, ZHONG nao, YAN Yun-qi. Influence of pH value on chromate-free conversion coating for magnesium alloys[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(A03): 1819-1822 |
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| Authors: | WENG Wen-ping CHEN Qi ZHANG Hui ZHONG nao YAN Yun-qi |
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| Abstract: | 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 ofpH 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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| Keywords: | magnesium alloys AZ31 alloy conversion coating pH value phosphate-permanganate |
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