| HAO Jian-min,WEI Xiao-yi,CHEN Yong-nan,CHEN Hong.Color Characteristic and Formation Mechanism of Black Ceramic Coating by Micro Arc Oxidation on 1060 Aluminum Alloy[J],43(1):44-49 |
| Color Characteristic and Formation Mechanism of Black Ceramic Coating by Micro Arc Oxidation on 1060 Aluminum Alloy |
| Received:September 05, 2013 Revised:November 19, 2013 |
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| DOI： |
| KeyWord:aluminum alloy micro-arc oxidation black ceramic film blackness |
| Author | Institution |
| HAO Jian-min |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
| WEI Xiao-yi |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
| CHEN Yong-nan |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
| CHEN Hong |
Material Surface Strengthening Research Institute, Chang'an University, Xi'an , China |
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| Abstract: |
| Objective Black ceramic coating was obtained by micro-arc oxidation on the surface of 1060 aluminum alloy and the mechanism of the black ceramic coating was discussed. Methods The blackness,composition, microstructure of ceramic coating in different electrolytes were studied by color measurement instrument, EDS, XPS, SEM and other methods. Results The results showed that the addition amount of Na2WO4 and NH4VO3had great effects on the coating color features and apparent morphology, as the Na2WO4 and NH4VO3contents increased, the blackness degree of the membrane layer increased, while the surface roughness decreased. Conclusion In the process of micro-arc oxidation, the WO42-and VO3-ions in the electrolyte were involved in the film forming reaction, generating the V2O5, V2O3, WOxand WO3 oxides with black color characteristics, which were distributed throughout the film layer and the porous structure, leading to the black color features. With the increase in the addition amount of Na2WO4and NH4VO3, the amount of color oxides in the membrane layer and the pore structure increased, reducing the roughness of the film layer. |
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