论文部分内容阅读
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。
In the basic electrolyte K2ZrF6, a ZrO2 ceramic coating was prepared on the surface of AZ31 magnesium alloy by using plasma electrolytic oxidation (PEO) technique. The discharge characteristics of PEO, the composition of the plasma field, the morphology of the ZrO2 ceramic coating, the phase composition, the corrosion resistance and the contact angle of the surface were investigated. The results show that the surface of ZrO2 ceramic coating is uniform and dense in cross section. The coating mainly consists of cubic phase, tetragonal phase and monoclinic ZrO2. The corrosion resistance of ZrO2 coating is improved by six orders of magnitude compared with the matrix. The obtained ZrO2 ceramic coating shows hydrophobicity and is favorable for improving the corrosion resistance of the matrix material. Plasma discharge sparks active species mainly by Na, K, Mg, Al, H, O, O2, H2O, H2O +, O +, OI and ZrO2 composition.