| GUAN Yu-qin,WU Wei-she,DU Jun,FAN Ting,MU Song-lin,LI Wen-fang.Study on Preparation and Properties of Ce-Mn/ Mo Composite Conversion Coating on 6063 Aluminum Alloy[J],43(6):79-83 |
| Study on Preparation and Properties of Ce-Mn/ Mo Composite Conversion Coating on 6063 Aluminum Alloy |
| Received:June 28, 2014 Revised:December 10, 2014 |
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| DOI： |
| KeyWord:aluminum alloy Ce-Mn / Mo composite conversion coating corrosioen resistance weatherability |
| Author | Institution |
| GUAN Yu-qin |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
| WU Wei-she |
Huachang Aluminum Factory Co. Ltd, Foshan , China |
| DU Jun |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
| FAN Ting |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
| MU Song-lin |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
| LI Wen-fang |
School of Materials Science and Engineering, South China University of Technology, Guangzhou , China |
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| Abstract: |
| Objective To improve the comprehensive properties of the Ce-Mn conversion coating deposited on 6063 aluminum alloy. Methods The Ce-Mn conversion coating was firstly prepared in the solution mainly containing cerium nitrate and potassium permanganate. After that, the Ce-Mn coating was post-treated in the molybdate solution, the treatment processes were optimized, a novel Ce-Mn/ Mo composite conversion coating was formed and its microstructure and properties were characterized. Results The optimal film formation process parameters were as following: Na2MoO4 18 g/ L, sodium dodecyl benzene sulfonate(SDBS)1. 5 g/ L, conversion time 18 min, deposition temperature 45 ℃. After post-treatment, the color of the Ce-Mn coating changed from golden yellow to brownish-black. The test result showed that the Ce-Mn/ Mo composite coating was uniform and dense tissue. This coating was mainly composed of Ce, Mn, Mo, O and Al elements, and the thickness of Ce-Mn/ Mo composite conversion coating was significantly increased to about 7 μm. The corrosion current density was reduced by about 85% . Conclusion Compared with the CeMn coating, the Ce-Mn / Mo composite coating exhibited excellent corrosion resistance, weatherability and wear resistance. |
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