Effects of electrical parameters and their interactions on plasma electrolytic oxidation coatings on aluminum substrates  

电参数及其交互作用对铝材等离子体电解氧化膜的影响

作　　者：Ling-yun AN Ying MA Xiao-xu YAN Sheng WANG Zhan-ying WANG 安凌云;马颖;剡晓旭;王晟;王占营(兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050)

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第4期883-895,共13页中国有色金属学报（英文版）

基　　金：Project(1111RJDA011)supported by the Creative Research Group Fund of Gansu Province,China;Project(SKLAB02015006)supported by the State Key Laboratory Open Fund of Advanced Processing and Recycling of Nonferrous Metals,China。

摘　　要：Based on orthogonal experiments,the effects of voltage,frequency,duty ratio and their interactions on the thickness and corrosion resistance of coatings prepared by plasma electrolytic oxidation(PEO)on aluminum in an alkaline silicate-containing electrolyte were investigated.The thicknesses of these coatings were obtained by measuring their cross-section using Image J software.Their corrosion resistances were evaluated in HCl and NaCl media through spot test and electrochemical test.The results show that the experimental design of this study is the key to investigate the interactions among these electrical parameters.Additionally,not only each independent factor,but also their interactions exhibit a remarkable influence on the coatings.The combination of high voltage,low frequency and large duty ratio significantly increases the coating thickness and content of the corrosion resistance phase,and thus improves the corrosion resistance of the coating in HNO3 medium.Conversely,the coating possessing the densest microstructure and best corrosion resistance in NaCl medium is obtained when low voltage and high frequency match with a small duty ratio.在碱性硅酸盐体系中对纯铝进行等离子体电解氧化处理。采用正交实验研究电压、频率、占空比及其交互作用对等离子体电解氧化膜层厚度和耐蚀性能的影响。通过Image J软件测量膜层截面以获得膜层厚度,并分别采用点滴和电化学实验评价膜层在HNO3和NaCl介质中的耐蚀性能。结果表明,本研究实验设计是研究电参数间交互作用的关键所在。各电参数不仅独立地影响膜层,而且其交互作用也显著影响膜层。高电压、低频率和大占空比间的交互作用使膜层厚度和耐蚀物相含量显著增加,进而改善膜层在HNO3腐蚀介质中的耐蚀性能;反之,低电压、高频率和小占空比间的交互作用使膜层最为致密,膜层在NaCl腐蚀介质中的耐蚀性最佳。

关 键 词：ALUMINUM plasma electrolytic oxidation VOLTAGE FREQUENCY duty ratio interaction orthogonal experiments corrosion resistance 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属表面处理]