| MA Deng-long,LIANG Yan-ping.Study on Process Improvement for Chrome-free Chemical Conversion Film on Aluminum Alloy[J],37(5):49-51 |
| Study on Process Improvement for Chrome-free Chemical Conversion Film on Aluminum Alloy |
| Received:July 15, 2008 Revised:October 10, 2008 |
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| DOI： |
| KeyWord:Aluminum alloy Conversion coating Conductive film Molybdate |
| Author | Institution |
| MA Deng-long |
School of Science of Xidian University, Xian , China |
| LIANG Yan-ping |
School of Science of Xidian University, Xian , China |
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| Abstract: |
| In order to develop an environment friendly method to form chemical conversion coating on aluminum surface without the toxic hexavalent charomium compounds, a process with ammonium molybdate and potassium penmanganate as the oxidants in the treating solution was mvestigated. The deep-yellow molydate conductive conversion coating on the aluminum alloy was obtained by adding ingredients such as NaF, SnCl2, Ce2 ( S04) 3 to the aqueous solution and taking the process of immersion. To find a better process, the different dealing ways before and after treating in the conversion solution were taken. The results show that the SnCl2 can debase the electric resistance of the coatings ( to the 2. 45 mΩ . cm) . And corrosion resistance can be improved evidently by adding Ce2 ( S04 ) 3' For the aluminum alloy, the conversion coating treated with in boiling water before its treating and sealed in hot water after treating can provide excellent corrosion protection. |
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