| 7075铝合金微弧氧化电源波形对膜组织和性能的影响 |
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| 引用本文： | 江溢民,周雅,周佳.7075铝合金微弧氧化电源波形对膜组织和性能的影响[J].材料保护,2012,45(4):46-48,54,74. |
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| 作者姓名： | 江溢民 周雅 周佳 |
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| 作者单位： | 南昌航空大学“轻合金加工科学与技术”国防重点学科实验室,江西南昌,330063 |
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| 基金项目： | 江西省自然科学基金(2008GZC0043);江西省教育厅实验室基金(09678) |
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| 摘 要： | 为探讨不同电源波形对7075铝合金微弧氧化膜的影响,在Na2SiO3电解液体系中,分别采用恒直流、直流脉冲及交流不对称波形对7075铝合金进行微弧氧化,通过扫描电镜和X射线衍射仪分析了3种膜层的微观形貌和组成,考察了膜层的厚度、硬度、致密层比例及耐蚀性。结果表明:交流不对称氧化法获得的氧化膜性能最佳,膜层厚度达到100μm,硬度达到1 500 HV,致密层比例高达70%以上,耐蚀性最优。
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| 关 键 词： | 铝合金 微弧氧化 电源波形 膜组织 膜性能 |
Effect of Power Supply Mode on Microstructure and Corrosion Resistance of Micro-Arc Oxidation Coatings on 7075 Aluminum Alloy |
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| JIANG Yi-min,ZHOU Ya,ZHOU Jia.Effect of Power Supply Mode on Microstructure and Corrosion Resistance of Micro-Arc Oxidation Coatings on 7075 Aluminum Alloy[J].Journal of Materials Protection,2012,45(4):46-48,54,74. |
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| Authors: | JIANG Yi-min ZHOU Ya ZHOU Jia |
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| Affiliation: | (National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063,China) |
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| Abstract: | Micro-oxidation of 7075 Al alloy was conducted in electrolysis system of Na 2 SiO 3 with power supply modes of constant direct current,pulse direct current and asymmetrical alternating current.The microstructure and composition of three kinds of as-obtained micro-arc oxidation coatings were analyzed by means of scanning electron microscopy and X-ray diffraction.The thickness,hardness,ratio of compact layer,and corrosion resistance of the micro-arc oxidation coatings were measured.It was found that the oxide coating prepared with power supply mode of asymmetrical alternating current possessed a thickness of 100 μm,hardness of 1 500 HV,and compact layer ratio of above 70%,while its corrosion resistance was the best among the three kinds of micro arc oxidation coatings. |
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| Keywords: | 7075 Al alloy micro-arc oxidation power supply mode microstructure corrosion resistance |
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