| PENG Guang-huai,GUO Xue-feng,FANG Ling,HAN Bao-jun,ZHANG Xiao-lian.Effect of Negative Pulse Voltage on the Microstructure and Corrosion Resistance of Microarc Oxidation Film on A356 Aluminum Alloy[J],39(2):77-79 |
| Effect of Negative Pulse Voltage on the Microstructure and Corrosion Resistance of Microarc Oxidation Film on A356 Aluminum Alloy |
| Received:January 22, 2010 Revised:April 10, 2010 |
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| DOI： |
| KeyWord:microarc oxidation negative pulse voltage microstructure corrosion resistance |
| Author | Institution |
| PENG Guang-huai |
Gannan Normal University, Ganzhou , China |
| GUO Xue-feng |
Gannan Normal University, Ganzhou , China |
| FANG Ling |
Gannan Normal University, Ganzhou , China |
| HAN Bao-jun |
Gannan Normal University, Ganzhou , China |
| ZHANG Xiao-lian |
Gannan Normal University, Ganzhou , China |
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| Abstract: |
| The effect of negative pulse voltage on the microstructure and corrosion resistance of microarc oxidation film on A356 aluminum alloy treated by double pulse microarc technique was investigated by SEM, coating thickness gauge etc. The results show that the negative pulse voltage by its electrode reaction greatly influences the microstructure and corrosion resistance of microarc oxidation film: the film thickness increases obviously when the negative pulse voltage varies from zero to 160 V; Size of pore and roughness of film surface firstly decreases then follows by a vital increasing,coating has the optimal compactness when negative pulse voltage is 40 V; The microarc oxidation treatment obviously improves the corrosive resistance of alloy, the best corrosion resistance of the film is achieved when negative pulse voltage is 0 V. |
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