| LIN Bi-lan,LU Jin-tang,KONG Gang.Anti-corrosion Comparison and Self-repairing Preliminary Discussion of Several Modified Phosphate Coatings[J],39(1):37-40 |
| Anti-corrosion Comparison and Self-repairing Preliminary Discussion of Several Modified Phosphate Coatings |
| Received:October 26, 2009 Revised:February 10, 2010 |
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| DOI： |
| KeyWord:Phosphate coatings Corrosion resistance Self-repairing Chromate passivation coatings |
| Author | Institution |
| LIN Bi-lan |
School of Materials Science and Engineering, South China University of Technology,Guangzhou , China |
| LU Jin-tang |
School of Materials Science and Engineering, South China University of Technology,Guangzhou , China |
| KONG Gang |
School of Materials Science and Engineering, South China University of Technology,Guangzhou , China |
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| Abstract: |
| Several modified phosphate coatings obtained by molybdate additives, molybdate post-sealing, cerium nitrate post-sealing, or silicate sol post-sealing were developed to be as the replacers of high-toxic chromate passivation coatings. The corrosion resistance of four modified phosphate coatings, several chromium-free conversion coatings and chromate passivation coatings was compared using neutral salt spray(NSS)test, Tafel polarization and electrochemical impedance spectroscopy(EIS)measurements. The morphology and chemical compositions of the scratches on three samples with modified composite coatings after NSS test were analyzed using scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS). The self-healing performance of the modified composite coatings was discussed preliminarily. The results show that the corrosion resistance of three composite coatings is remarkably superior to that of chromate coatings; Three composite coatings are self-repairable and are the promising replacers of chromate passivation coatings; The anti-corrosion performance of the composite coatings post-sealing with silicate sol is optimal. |
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