镁合金表面ZrO_2涂层的等离子体电解氧化制备及其放电特性  

Preparation of ZrO_2 Coatings by Plasma Electrolytic Oxidation on Surface of Magnesium Alloys and Its Discharge Characteristics

作　　者：王丽[1] 付文[1,2] 陈砺[2] 

机构地区：[1]广东石油化工学院化工与环境工程学院,广东茂名525000 [2]华南理工大学化学与化工学院,广州510640

出　　处：《硅酸盐学报》2012年第12期1802-1806,共5页Journal of The Chinese Ceramic Society

基　　金：广东省自然科学基金(S2011040001765)项目;广东高校石油化工污染控制与清洁生产工程技术开发中心(203517)资助

摘　　要：采用等离子体电解氧化(plasma electrolytic oxidation,PEO)技术在基础电解液K2ZrF6中,在AZ31镁合金表面制备ZrO2陶瓷涂层。对PEO过程放电特性、等离子体场的成分、ZrO2陶瓷涂层表面及截面形貌、晶相组成、耐腐蚀性能及表面接触角进行了研究。结果表明:制得的ZrO2陶瓷涂层表面均匀,截面致密,涂层主要由立方相、四方相及单斜相ZrO2组成。ZrO2涂层耐腐蚀性能相对于基体提高了6个数量级。制得的ZrO2陶瓷涂层表现出疏水性,有利于提高基体材料的耐腐蚀性能。等离子体场内放电火花活性物种主要由Na、K、Mg、Al、H、O、O2、H2O、H2O+、O+、OI及ZrO2组成。The ZlO2 ceramic coatings on the surface of AZ31 magnesium alloy were deposited via plasma electrolytic oxidation （PEO） in a base electrolyte solution of K2ZrFt. The discharge characteristics of the PEO process, the composition of the plasma field, and the surface and cross-section morphologies of the ZrO2 ceramic coatings, the phase composition, the corrosion resistance and the surface contact angle of the coatings were investigated. The results show that the prepared ZrO2 ceramic coatings exhibit a uniform surface morphology and a compact cross section. The coatings were mainly composed of the cubic, tetragonal and monoclinlc ZrO2 phases. The corrosion resistance of the coatings was increased by 6-0rder magnitude, compared to that of the substrate. The ZrO2 ceramic coatings exhibited the hydrophobie characteristics, which could favor the improvement of the corrosion resistance of the substrate material. The active species of discharge sparks in the plasma field were composed of Na, K, Mg, A1, H, O, O2, H2O, H2O＋, O＋, OI and ZrO2.

关 键 词：镁合金 氧化锆陶瓷涂层 等离子体电解氧化 等离子体场 疏水性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]