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| Mg-7Li合金微弧氧化过程放电规律及涂层耐蚀性分析 |
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李俊刚1,2, 吕迎2, 李慕勤2, 王宏伟1, 朱兆军1, 魏尊杰1, 孟祥才2
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1.哈尔滨工业大学材料科学与工程学院, 哈尔滨 150001;2.佳木斯大学材料科学与工程学院, 佳木斯 154007
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| 摘要: |
| 文中采用高速摄影机、原子力显微镜和电化学工作站研究了Mg-7Li合金表面微弧氧化过程的放电规律以及涂层的耐蚀性.结果表明,在硅酸钠溶液中,微弧氧化电源一个脉冲周期内同一位置的放电击穿持续到脉冲结束;不同脉冲周期内,放电击穿反复在同一位置进行,其断续时间达到160 ms以上.表面制备微弧氧化涂层合金的电极电位比基体提高了78.1 mV,腐蚀电流密度降低2个数量级,显著提高了镁锂合金的耐蚀性. |
| 关键词: 镁锂合金 微弧氧化 放电 耐蚀性 |
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| 基金项目:国家自然科学基金资助项目(31070859) |
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| Discharge during microarc oxidation process on Mg-7Li alloy and its corrosion resistance |
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LI Jungang1,2, LÜ Ying2, LI Muqin2, WANG Hongwei1, ZHU Zhaojun1, WEI Zunjie1, MENG Xiangcai2
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1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2.School of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, China
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| Abstract: |
| High-speed camera,atomic force microscope and electrochemical workshop were used to investigate discharge regularity during the microarc oxidation process and the corrosion resistance of the coating on Mg-7Li alloy.Results showed that discharge breakdown at the same location continues to the end of the pulse during a pulse period of the power in Na2SiO3 solution, while the discharge breakdown occurs at the same location repeatedly with intermittent time up to 160 ms in different pulse periods.The electrode potential of the coating coated alloy increases by 78.1 mV and its corrosion current density decreases by 2 orders of magnitude compared with that of the substrate, which improves the corrosion resistance of Mg-7Li alloy significantly. |
| Key words: Mg-Li alloy microarc oxidation discharge corrosion resistance |
