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| Effects of Power Supply Modes on the Microstructure and Properties of Micro-arc Oxidation Coatings Formed on ADC12 High Silicon Aluminum Alloy |
| Received:July 18, 2020 Revised:July 29, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.08.015 |
| KeyWord:high silicon aluminum alloy power supply mode micro arc oxidation ceramic coating microstructure property |
| Author | Institution |
| ZHANG Guang-sheng |
School of Materials Science and Engineering, Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China |
| DING Wei-guo |
Xinchang County Dijia Light Metals Science and Technology Co., Ltd, Shaoxing , China |
| JIANG Bo |
School of Materials Science and Engineering, Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China |
| WANG Chao |
School of Materials Science and Engineering, Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China |
| SONG Ren-guo |
School of Materials Science and Engineering, Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China;Xinchang County Dijia Light Metals Science and Technology Co., Ltd, Shaoxing , China |
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| Abstract: |
| The work aims to study the effects of three power modes on the performance of micro arc oxidation coating on ADC12 high silicon aluminum alloy, so as to select the power mode leading to the better performance of micro arc oxidation coating. Under three different power supply modes (AC power supply, unipolar pulse power supply and bipolar pulse power supply), ceramic coatings were prepared on the surface of ADC12 high silicon aluminum alloy by micro arc oxidation (MAO) technology. The microstructure and properties of micro arc oxidation coating on ADC12 aluminum alloy were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness tester and friction and wear tester. α-Al2O3, γ-Al2O3 and Al9Si phases existed in the micro arc oxidation coating under three power supply modes. The micro arc oxidation coating prepared under double pulse mode had the best compactness, with a thickness of 15 μm, a hardness of 719 HV, a friction coefficient of about 1.2, and a load leading to falling of coating and substrate of 25.8 N. The MAO coating prepared under the AC power supply had the lowest thickness of 9 μm, a hardness of 698 HV, a friction coefficient of about 1.35, and a load leading to falling of coating and substrate of 15.9 N. The MAO coating under the unipolar mode had a thickness of 17 μm, a hardness of 706 HV, a friction coefficient of about 1.35, and a load leading to falling of coating and substrate of 13.09 N. Through the comparison of three power supply modes, the comprehensive performance of the coating on ADC12 high silicon aluminum alloy under bipolar pulse power supply mode is better. |
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