| OUYANG Ke-ning,ZHAO Jing-mao,XIE Xiong,FU Wen-jing.Influence of Power Mode on Particles-doping during Magnesium Alloy Micro Arc Oxidation Process[J],44(10):1-6,15 |
| Influence of Power Mode on Particles-doping during Magnesium Alloy Micro Arc Oxidation Process |
| Received:May 22, 2015 Revised:October 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.10.001 |
| KeyWord:magnesium micro arc oxidation(MAO) power mode electrophoresis Y2 O3 corrosion resistance |
| Author | Institution |
| OUYANG Ke-ning |
Beijing University of Chemical Technology, Beijing , China |
| ZHAO Jing-mao |
Beijing University of Chemical Technology, Beijing , China |
| XIE Xiong |
Beijing University of Chemical Technology, Beijing , China |
| FU Wen-jing |
Beijing University of Chemical Technology, Beijing , China |
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| Abstract: |
| Objective Particles-containing electrolytes are commonly employed as one of the most important methods to produce better micro arc oxidation coatings. The relationship between the MAO coating property and power mode used was described in this paper. Methods Ceramic coatings were produced by micro arc oxidation in electrolyte containing various particles concentration in unipolar and bipolar power mode, respectively. The properties of coatings were evaluated in respect of surface morphologies, elementary distribution, cross-section morphologies, and corrosion resistance. Results The particles dispersed in electrolyte were negatively charged, and particles-doping during MAO process was driven by electrophoresis. Particles were directly migrated to the anode in unipolar power mode, accumulating around the sample and adsorbed to the sample surface to participate in the formation process of the micro arc oxidation coatings. With increasing particles concentration in electrolyte, the amount of Y2 O3 particles and the content of Y element on the surface of the MAO coatings increased, enhancing the density and corrosion resistance of the coatings. However, only a few particles doped in MAO coating as the power mode turned to bipolar due to alternate variations of electric field. The influences of particles concentration on the surface and cross-section morphologies, surface elementary distribution, corrosion resistance of MAO coatings were not apparent. Conclusion Particles-doping was affected by electric force. In unipolar power mode, the doping concentration of particles had obvious effect on the performance of the coatings, whereas in the bipolar power mode, introduction of negative current had adverse effect on the doping of particles into the oxidation coatings, and the doping concentration of particles had no obvious effect on the coating performance. |
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