7075铝合金基体粗糙度对微弧氧化陶瓷膜层表面质量的影响
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摘要
铝合金微弧氧化陶瓷膜层的应用主要取决于膜层表面质量,而影响表面质量的因素有很多。在恒压下采用固定的氧化工艺对不同表面粗糙度的7075铝合金进行微弧氧化处理,并通过粗糙度仪、测厚仪、划痕仪、高温摩擦磨损试验机、X射线衍射仪(XRD)和扫描电镜(SEM)研究了基体粗糙度对膜层表面质量的影响及形成机理。结果表明:在固定的微弧氧化工艺参数下,随着基体粗糙度的降低,膜层表面粗糙度和厚度及其分布随之下降,且下降趋势逐渐变缓并趋于稳定,而膜层结合力随之增强,但对耐磨性的影响不大。此外,对于基体粗糙度大的铝合金,微弧氧化处理能有效降低其膜层表面粗糙度,而对于基体粗糙度小的铝合金,微弧氧化处理反而增加了膜层表面粗糙度。
The application of micro-arc oxidation (MAO) ceramic coatings for aluminum alloy mainly depends on its surface quality,and there are many factors affecting the coating surface quality. The MAO treatment of 7075 aluminum alloy with different surface roughness under constant pressure and fixed oxidation process parameters was carried out,the effect of substrate surface roughness on the coating surface quality and the MAO formation mechanism were studied by means of roughness tester,thickness tester,scratch tester,high temperature friction and wear tester,X-ray diffractometer and scanning electron microscope (SEM). The results show that with the reduction of substrate roughness,the surface roughness,thickness and thickness distribution of coatings decrease gradually,and the downward trend gradually slows down and becomes stable,then the adhesion of coatings increases,which has almost no effect on wear resistant. In addition,for the aluminum alloy with large substrate roughness,the surface roughness of coatings can be effectively reduced by the MAO treatment,and vice versa.
The application of micro-arc oxidation (MAO) ceramic coatings for aluminum alloy mainly depends on its surface quality,and there are many factors affecting the coating surface quality. The MAO treatment of 7075 aluminum alloy with different surface roughness under constant pressure and fixed oxidation process parameters was carried out,the effect of substrate surface roughness on the coating surface quality and the MAO formation mechanism were studied by means of roughness tester,thickness tester,scratch tester,high temperature friction and wear tester,X-ray diffractometer and scanning electron microscope (SEM). The results show that with the reduction of substrate roughness,the surface roughness,thickness and thickness distribution of coatings decrease gradually,and the downward trend gradually slows down and becomes stable,then the adhesion of coatings increases,which has almost no effect on wear resistant. In addition,for the aluminum alloy with large substrate roughness,the surface roughness of coatings can be effectively reduced by the MAO treatment,and vice versa.
引文
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[2]Dehnavi V,Shoesmith D W,Luan B L,et al.Corrosion properties of plasma electrolytic oxidation coatings on an aluminium alloy-The effect of the PEOprocess stage[J].Materials Chemistry and Physics,2015,161:49-58.
[3]Nie X,Leyland A,Song H W,et al.Thickness effects on the mechanical properties of micro-arc discharge oxide coatings on aluminum alloys[J].Surface and Coatings Technology,1999,116-119:1055-1060.
[4]Sung D,Kim D,Park J H,et al.Effect of composite PEO film containing titanium oxides on the corrosion resistance of Al 6061 alloy[J].Surface and Coatings Technology,2016(11):258-262.
[5]蒋百灵,张淑芬,吴建国.镁合金微弧氧化陶瓷层耐蚀性的研究[J].中国腐蚀与防护学报,2002,22(5):66-69.Jiang Bailing,Zhang Shufen,Wu Jianguo.The study of the corrosion resistance of the ceramic coatings formed by micro-arc oxidation on the Mg-base alloy[J].Journal of Chinese Society for Corrosion and Protection,2002,22(5):66-69.
[6]薛文斌,蒋兴莉,杨卓,等.6061铝合金微弧氧化陶瓷膜的生长动力学及其性能分析[J].功能材料,2008,39(4):603-610.Xue Wenbin,Jiang Xingli,Yang Zhuo,et al.The growth kinetics and properties of ceramic films fabricated by microarc oxidation on 6061 aluminum alloy[J].Journal of Functional Materials,2008,39(4):603-610.
[7]Krishna L R,Purnima A S.Kinetics and properties of micro-arc oxidation coatings deposited on commercial Al alloys[J].Metallurgical and Materials Transactions A,2007,38(2):370-378.
[8]潘明强,韦东波,迟关心,等.恒流微弧氧化工艺参数对膜层表面粗糙度的影响[J].材料保护,2009,42(7):29-32.Pan Mingqiang,Wei Dongbo,Chi Guanxin,et al.Effect of micro-arc oxidation parameters in constant current mode on the surface roughness of alumina coatings[J].Materials Protection,2009,42(7):29-32.
[9]Tran Q P,Kuo Y C,Sun J K,et al.High quality oxide-layers on Alalloy by micro-arc oxidation using hybrid voltages[J].Surface and Coatings Technology,2016,303:61-67.
[10]肖晓玲,陈兴驰,况敏,等.不同电解液体系对6061铝合金微弧氧化膜层的影响[J].材料保护,2014,47(s2):16-19.Xiao Xiaoling,Chen Xingchi,Kuang Min,et al.Influence of different electrolytes on micro arc oxidation coatings on aluminum alloy 6061[J].Materials Protection,2014,47(s2):16-19.
[11]苗景国,张玉波,沈钰,等.三乙醇胺对7075铝合金微弧氧化陶瓷膜层形貌及性能的影响[J].铝合金加工技术,2015,43(10):44-48.Miao Jingguo,Zhang Yubo,Shen Yu,et al.Effect of triethanolamine on morphology and properties of the micro-arc oxidation ceramic coatings of 7075 aluminum alloy[J].Light Alloy Fabrication Technology,2015,43(10):44-48.
[12]李振伟,狄士春.2024铝合金微弧氧化/Ti C复合膜的制备及耐磨性能[J].电加工与模具,2016(4):53-57.Li Zhenwei,Di Shichun.Preparation and wear resistance of microarc oxidation composite coatings containing Ti C particles on 2024aluminum alloy[J].Electromachining Mould,2016(4):53-57.
[13]赵豪民,江俊灵,戴新江.铝材微弧氧化功率与表面粗糙度的关系[J].材料保护,2005,38(5):66-67.Zhao Haomin,Jiang Junling,Dai Xinjiang.Relationship between microarc oxidation power and surface roughness of aluminum[J].Materials Protection,2005,38(5):66-67.
[14]潘明强.微弧氧化膜层形成及其表面粗糙度的研究[D].哈尔滨:哈尔滨工业大学,2009.