| LI Hong-ling,LIU Qing-ling.Research on Performance of Chrome-free Rare Earth Lanthanum Conversion Coating on 6061 Aluminum Alloy Surface[J],42(3):42-45,55 |
| Research on Performance of Chrome-free Rare Earth Lanthanum Conversion Coating on 6061 Aluminum Alloy Surface |
| Received:January 24, 2013 Revised:February 15, 2013 |
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| DOI： |
| KeyWord:aluminum alloy conversion coating chrome-free rare earth corrosion resistance adhension |
| Author | Institution |
| LI Hong-ling |
Chemistry and Chemical Industry Academy, Xinxiang Normal College, Xinxiang , China |
| LIU Qing-ling |
Chemistry and Chemical Industry Academy, Xinxiang Normal College, Xinxiang , China |
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| Abstract: |
| The anti-corrosion of the conversion coating which is formed by La( NO3)3 ·6 H2O was evaluated with polarization curve, and also compared the chromium phosphate film and non-rare phosphate conversion coating. Adhesion force between the conversion coatings and the organic coating were studied through crossing grid method and immersing corrosion test .The results showed that the transmission resistance of conversion coating with rare earth additive was increased by comparing with non-rare phosphate conversion coating; The anti-corrosion of the conversion coating was increased noticeably. But comparing with chromium phosphting, in the weak polarized scope, both of the corrosion resistances were close. Adhesion force between the conversion coating with rare earth as additive and the organic coating was obviously superior to that of chromate phosphate process. |
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