| LI Shu,DONG Yin-sheng,SHENG Xiao-bo,GUO Chao,CHU Cheng-lin.Preparation and Characterization of a Composite Coating on AZ31 for Biomedical Application[J],39(1):41-44 |
| Preparation and Characterization of a Composite Coating on AZ31 for Biomedical Application |
| Received:October 23, 2009 Revised:February 10, 2010 |
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| DOI： |
| KeyWord:Biomedical AZ31 Composite coating Anodic oxidation Chemical conversion |
| Author | Institution |
| LI Shu |
Southeast University, Nanjing , China |
| DONG Yin-sheng |
Southeast University, Nanjing , China |
| SHENG Xiao-bo |
Southeast University, Nanjing , China |
| GUO Chao |
Southeast University, Nanjing , China |
| CHU Cheng-lin |
Southeast University, Nanjing , China |
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| Abstract: |
| In order to improve corrosion resistance of AZ31 magnesium alloy for biomedical application, a composite coating was prepared on AZ31 with the combination of applications of anodic oxidation and chemical conversion technology. The morphology of the coating was observed by SEM and its phases was analyzed by XRD while its property was characterized by electrochemical testing instrument. It is showed that the first coating prepared by anodic oxidation is rough and uneven observed, composed mainly by Mg(OH)2and Al2O3;After chemical conversion, the final composite coating is dense and even, showing proper contents of N, O, P. The potentiodynamic polarization curve demonstrates that the composite coating reduced corrosive rate of AZ31 magnesium alloy evidently. And the simulated circuit of the electrochemical impedance spectroscopy reveals the four-layer structure of the prepared composite coating, proving indirectly the chemical bonding between the anodic oxidized coating and the chemical conversion coating. |
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