铝合金微弧氧化复合电解液的优化研究  

Optimization Study of Compound Electrolytes for Aluminum Alloy Micro-Arc Oxidation

作　　者：王俊 冯军 金凡亚[2] 赵颖超 杨旭东 袁绍华 齐华荣 WANG Jun;FENG Jun;JIN Fanya;ZHAO Yingchao;YANG Xudong;YUAN Shaohua;QI Huarong(School of Mechanical Engineering,University of South China,Hengyang 421001,China;Southwest Institute of Physics of Nuclear Industry,Chengdu 610041,China)

机构地区：[1]南华大学机械工程学院,湖南衡阳421001 [2]核工业西南物理研究院,四川成都610041

出　　处：《材料保护》2024年第6期131-138,共8页Materials Protection

基　　金：国家自然科学基金项目(52305313)。

摘　　要：为了得到成膜性和耐磨性良好且较厚的陶瓷膜层,以磷酸钠和六偏磷酸钠为基础电解液,同时加入钨酸钠和四硼酸钠作为添加剂,组成一种新型的复合电解液。在此复合电解液体系下,对1060铝合金进行微弧氧化处理。以膜层厚度和膜层表面孔隙率为优化指标,利用L_(9)(3^(4))正交试验优化电解液配方,研究了在此电解液配方下制备出的陶瓷膜层的微观形貌、表面孔隙率、物相组成、厚度、显微硬度和耐磨性。结果表明:用磷酸钠浓度为32.0 g/L、四硼酸钠浓度为16.0 g/L、钨酸钠浓度为4.5 g/L、六偏磷酸钠为30.0 g/L的配方制备出的陶瓷层表面微孔均匀、膜层致密,陶瓷层厚度达22.8μm,膜层孔隙率为3.86%,显微硬度达475 HV,耐磨性较基体有较大幅度提升,陶瓷层主要由γ-Al_(2)O_(3)和少量α-Al_(2)O_(3)构成。For obtaining a thick ceramic coating with good film-forming and wear resistance,a new type of composite electrolyte was composed of sodium phosphate and sodium hexametaphosphate as the basic electrolytes,while sodium tungstate and sodium tetraborate were added as additives.In this composite electrolyte system,micro-arc oxidation treatment was performed on 1060 aluminum alloy.Using the coating thickness and surface porosity as optimization indicators,the electrolyte formula was optimized using the L_(9)(3^(4))orthogonal test.Meanwhile,the microstructure,surface porosity,phase composition,thickness,microhardness and wear resistance of ceramic coatings prepared under this electrolyte formula were studied systematically.Results showed that the ceramic coating prepared with a formula of Na_(3)PO_(4) concentration of 32.0 g/L,Na_(2)B_(4)O_(7) concentration of 16.0 g/L,Na_2WO_4 concentration of 4.5 g/L and(NaPO_(3))_(6) concentration of 30.0 g/L had the structure with uniform micropores and dense film layer,the thickness of 22.8μm,the porosity of 3.86%,and the microhardness of 475 HV.Furthermore,the wear resistance of the coating was significantly improved compared to the substrate,and the ceramic coating were mainly composed of γ-Al_(2)O_(3) and a small amount ofα-Al_(2)O_(3) composition.

关 键 词：铝合金 微弧氧化 正交试验 氧化铝陶瓷膜层 

分 类 号：TG174.451[金属学及工艺—金属表面处理]