| 终止电压对MB8镁合金微弧氧化膜耐蚀性的影响 |
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| 引用本文： | 赵晴,章志友,陈宁.终止电压对MB8镁合金微弧氧化膜耐蚀性的影响[J].表面技术,2007,36(4):4-6. |
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| 作者姓名： | 赵晴 章志友 陈宁 |
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| 作者单位： | 南昌航空工业学院,江西,南昌,330063;南昌航空工业学院,江西,南昌,330063;南昌航空工业学院,江西,南昌,330063 |
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| 摘 要： | 采用SEM、XRD、动电位极化曲线及电化学阻抗等测试方法,研究了MB8镁合金微弧氧化过程中不同终止电压下获得的陶瓷膜层的耐蚀性能.结果表明:终止电压越高,膜层越厚;微火花阶段,膜层表面均匀、结晶细致,腐蚀电流密度较小,阻抗较大;弧放电阶段,膜层孔径变大,陶瓷层内显微缺陷增多,腐蚀电流密度增大,阻抗减小.由此得出结论:膜层耐蚀性能由膜层厚度与终止电压共同决定,微火花放电末期膜层的耐蚀性能优于弧放电阶段的耐蚀性能.
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| 关 键 词： | 微弧氧化 镁合金 耐蚀性 终止电压 |
| 文章编号： | 1001-3660（2007）04-0004-03 |
| 收稿时间： | 2007/3/15 0:00:00 |
| 修稿时间： | 2007-03-15 |
Effect of Final Voltage on Corrosion Resistance of MB8 Mg Alloys by Micro-arc Oxidation |
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| ZHAO Qing,ZHANG Zhi-you and CHEN Ning.Effect of Final Voltage on Corrosion Resistance of MB8 Mg Alloys by Micro-arc Oxidation[J].Surface Technology,2007,36(4):4-6. |
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| Authors: | ZHAO Qing ZHANG Zhi-you and CHEN Ning |
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| Affiliation: | Nanchang Institute of Aeronautical Technology, Nanchang 330063, China |
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| Abstract: | With scanning electron microscopy(SEM),X-ray Diffraction(XRD),potentiodynamism polarization curves,electronmicroscopy impeclance spectroscopy(EIS),corrosion resistance of membrane produced at different final voltage on MB8 magnesium alloy substrates by micro-arc oxidation (MAO) technique had been investigated.The results show: the higher the final voltage,the thicker the membrane;micro sparking oxide coating exhibites better performance of compact,homogeneous and high resistance comparing with arc-oxide coatings in which pore diameter augment and micro-defect multiply of ceramic coatings.Thereby comes to the conclusion that the membrane level erosion codetermines with membrane thickness and final voltage,the erosion of membrane at micro spark discharge last stage excels than arc discharge membrane. |
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| Keywords: | Micro-arc oxidation Magnesium alloy Corrosion resistance Final voltage |
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