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| Effect of Cathodic Current Density on Compactness of Micro Arc Oxidation Film on LY12 Al Alloy |
| WANG Yong1, TIAN Ying2, GUO Quanzhong1, GUO Xinghua1, DU Keqin1, WANG Fuhui1 |
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. College of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116021, China |
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Abstract A micro arc oxidation (MAO) ceramic film on LY12 Al alloy was prepared by using bipolar pulsed power supply with changing cathodic current density (jc) while keeping a constant anodic current density (ja). The morphology, barrier property and practical service performance of the film were studied by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and neutral salt spray test. Then, the effect of jc on the film compactness was analyzed. Experimental results showed that the jc value was a key factor responsible to the film compactness. The film prepared by an appropriate jc value exhibited a good compactness, however, by a value above or below which the compactness of the films became worse due to that the electro-sparks ununiformly distributed throughout the Al alloy surface. When ja=5 A/dm2 and ja∶jc=1∶1, the MAO film on LY12 alloy showed the best compactness and protection performance.
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Received: 25 March 2013
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Cite this article:
WANG Yong,TIAN Ying,GUO Quanzhong,GUO Xinghua,DU Keqin,WANG Fuhui. Effect of Cathodic Current Density on Compactness of Micro Arc Oxidation Film on LY12 Al Alloy. Journal of Chinese Society for Corrosion and protection, 2013, 33(6): 475-480.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I6/475
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