电流密度对AlSi7Mg0.3铝合金微弧氧化陶瓷层性能的影响
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摘要
以采用微弧氧化技术在AlSi7Mg0.3铝合金表面制备的陶瓷层为研究对象,利用XRD和SEM等手段分析了陶瓷层的相组成及表面形貌,探讨了电流密度对成膜速率、膜层结构的影响,借助拉伸实验研究了陶瓷膜与基体的结合强度.研究结果表明:电流密度过大会使陶瓷层成膜速率加快、表面质量下降、结合力降低;微弧氧化陶瓷层主要由γ-Al_2O_3、α-Al_2O_3和少量Al_2(SiO_4)O组成,电流密度的变化会导致陶瓷层内γ-Al_2O_3和α-Al_2O_3的含量变化,在一定范围内,电流密度越高,γ-Al_2O_3的含量越多,陶瓷层性能越好;陶瓷层界面结合强度随着电流密度增加而增加,但过大的电流密度反而导致界面结合强度减小.
It takes ceramic coatings prepared on AlSi7Mg0.3 aluminum alloy by micro-arc oxidation technique as the study object in this paper,then the phase compositions and surface morphologies of ceramic coatings under different current densities are analyzed using XRD and SEM techniques,the effects of different current densities on the rates of ceramic coating formation and the structures of ceramic coatings are discussed,and the interfacial bonding strength between ceramic coatings and AlSi7Mg0.3 aluminum alloys is studied by means of tensile tests.The results show that the rate of ceramic coating formation will increase,and the surface quality and the interfacial bonding strength will decrease if current density is too high.The micro-arc oxidation ceramic coatings are mainly composed of γ-Al_2O_3,α-Al_2O_3 and a small amount of Al_2(SiO_4)O,and the change of current density will change the contents ofγ-Al_2O_3 and α-Al_2O_3.The content of γ-Al_2O_3 will increase and the characteristics of ceramic coating will improve when current den-sity increase in a certain range.In addition,the bonding strength of ceramic coating increases with the increase of current density,but excessive current density will lead to the decrease of interfacial bonding strength.
It takes ceramic coatings prepared on AlSi7Mg0.3 aluminum alloy by micro-arc oxidation technique as the study object in this paper,then the phase compositions and surface morphologies of ceramic coatings under different current densities are analyzed using XRD and SEM techniques,the effects of different current densities on the rates of ceramic coating formation and the structures of ceramic coatings are discussed,and the interfacial bonding strength between ceramic coatings and AlSi7Mg0.3 aluminum alloys is studied by means of tensile tests.The results show that the rate of ceramic coating formation will increase,and the surface quality and the interfacial bonding strength will decrease if current density is too high.The micro-arc oxidation ceramic coatings are mainly composed of γ-Al_2O_3,α-Al_2O_3 and a small amount of Al_2(SiO_4)O,and the change of current density will change the contents ofγ-Al_2O_3 and α-Al_2O_3.The content of γ-Al_2O_3 will increase and the characteristics of ceramic coating will improve when current den-sity increase in a certain range.In addition,the bonding strength of ceramic coating increases with the increase of current density,but excessive current density will lead to the decrease of interfacial bonding strength.
引文
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[14]赵启翮,蔡珣,陈秋龙,等.6063铝合金微弧氧化膜性能研究[J].腐蚀与防护,2005,26(4):157-159.ZHAO Qihe,CAI Xun,CHEN Qiulong,et al.Performance of micro-arc oxidization films on aluminium alloy 6063[J].Corrosion and Protection,2005,26(4):157-159.(in Chinese)
[2]赵晖,朱其柱,金光,等.电流密度对纯铝微弧氧化膜结构及硬度的影响[J].深圳大学学报(理工版),2014,31(1):83-87.ZHAO Hui,ZHU Qizhu,JIN Guang,et al.Effect of current density on the structure and hardness of pure aluminum by micro arc oxidation coating[J].Journal of Shenzhen University(Science and Technology Edition),2014,31(1):83-87.(in Chinese)
[3]XUE W,WANG C,LI Y,et al.Effect of micro-arc discharge surface treatment on the tensile properties of Al-Cu-Mg alloy[J].Materials Letters,2002,56(5):737-741.
[4]MU Weiyi,HAN Yong.Characterization and properties of the MgF2/ZrO2 composite coatings on magnesium prepared by micro-arc oxidation[J].Surface&Coatings Technology,2008,202(17):4278-4284.
[5]夏伶勤,韩建民,李卫京,等.添加K2ZrF6对钛合金微弧氧化膜层组织结构的影响[J].北京交通大学学报,2013,37(2):114-118.XIA Linqin,HAN Jianmin,LI Weijing,et al.Effects of K2ZrF6additive on microstructure of micro-arc coatings fabricated on TA15alloy[J].Journal of Beijing Jiaotong University,2013,37(2):114-118.(in Chinese)
[6]辛世刚,赵荣根,都徽,等.铝合金表面氧化锆等离子体电解氧化涂层的制备及形成机理研究[J].无机材料学报,2009,24(1):107-110.XIN Shigang,ZHAO Ronggen,DU Hui,et al.Prepare and formation mechanism of the zirconia coating on aluminum alloy by plasma electrolytic oxidation[J].Journal of Inorganic Materials,2009,24(1):107-110.(in Chinese)
[7]段关文,李金富,王拥军,等.铝合金的微孤氧化研究[J].表面技术,2007,36(3):30-33.DUAN Guanwen,LI Jinfu,WANG Yongjun,et al.Study on the micro arc oxidation of aluminum alloy[J].Surface Technology,2007,36(3):30-33.(in Chinese)
[8]吴振东,姜兆华,姚忠平,等.纯铝及其合金微弧氧化陶瓷膜性能分析[J].稀有金属材料与工程,2006,35(增2):148-151.WU Zhendong,JIANG Zhaohua,YAO Zhongping,et al.Analysis of properties of micro arc oxidation ceramic coatings for aluminum and its alloys[J].Rare Metal Materials and Engineering,2006,35(S2):148-151.(in Chinese)
[9]李忠盛,吴护林,潘复生,等.7A55铝合金微弧氧化陶瓷层的组织与性能[J].航空材料学报,2010,30(5):54-57.LI Zhongsheng,WU Hulin,PAN Fusheng,et al.Micro structures and properties of ceramic layer on 7A55aluminum alloy by micro arc oxidation[J].Journal of Aeronautial Materia,2010,30(5):54-57.(in Chinese)
[10]贺永胜,赵志龙,刘一洋,等.铝合金微弧氧化热力学机理及影响因素的分析[J].电镀与环保,2005,25(6):40-42.HE Yongsheng,ZHAO Zhilong,LIU Yiyang,et al.Thermodynamics mechanism and affecting factors analysis of aluminum alloy micro arc oxidation[J].Electroplating and Pollution Control,2005,25(6):40-42.(in Chinese)
[11]李新东,沙春鹏.2D12-T4铝合金微弧氧化膜的性能研究[J].腐蚀科学与防护技术,2016,28(1):73-76.LI Xindong,SHA Chunpeng.Effect of micro-arc oxidation films on properties of 2D12-T4aluminum alloy[J].Corrosion Science and Protection Technology,2016,28(1):73-76.(in Chinese)
[12]王立世,潘春旭,蔡启舟,等.等离子体电解氧化过程中单个稳态微放电的热效应研究[J].物理学报,2007,56(9):5341-5346.WANG Lishi,PAN Chunxu,CAI Qizhou,et al.Study of the heat effect of single steady state micro discharge during plasma electrolytic oxidation[J].Acta Physica Sinica,2007,56(9):5341-5346.(in Chinese)
[13]刘荣明.铝合金微弧氧化工艺研究与机理分析[D].呼和浩特:内蒙古工业大学,2007.LIU Rongming.Process optimization and mechanism investigation of micro-arc oxidation on aluminum alloy[D].Hohhot:Inner Mongolia University of Technology,2007.(in Chinese)
[14]赵启翮,蔡珣,陈秋龙,等.6063铝合金微弧氧化膜性能研究[J].腐蚀与防护,2005,26(4):157-159.ZHAO Qihe,CAI Xun,CHEN Qiulong,et al.Performance of micro-arc oxidization films on aluminium alloy 6063[J].Corrosion and Protection,2005,26(4):157-159.(in Chinese)