电解液配方对纯镁微弧氧化膜层耐蚀性的影响  

Effect of Electrolyte Formulation on the Corrosion Resistance of Micro-arc Oxidation Coating of Pure Magnesium

作　　者：王占营[1] 马颖[1] 安守静 孙乐[1] WANG Zhanying;MA Ying;AN Shoujing;SUN Le(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]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

出　　处：《材料导报》2023年第15期169-178,共10页Materials Reports

基　　金：甘肃省创新研究群体计划(1111RJDA011)。

摘　　要：基于单纯形重心设计改变Na_(2)SiO_(3)、NaOH、KF和NaAlO_(2)四种组分的搭配,在纯镁基体上制备微弧氧化膜层,研究了电解液各组分及其搭配对膜层耐蚀性能的影响。结果表明,拟合得到的回归方程的显著性较好,预测精度高。通过标准化回归系数及帕累托分析可知,KF对膜层点滴及电化学耐蚀性的影响均较大。由响应面分析可知,KF有助于膜层点滴耐蚀性的提高,但高浓度的KF反而不利于电化学耐蚀性的提升。主盐Na_(2)SiO_(3)和NaAlO_(2)可以明显提高膜层的电化学耐蚀性。膜层点滴耐蚀性与电化学耐蚀性的腐蚀机制不同是导致电解质对二者的影响有所区别的根本原因。Based on simplex-centroid mixture design,micro-arc oxidation coatings were prepared on pure magnesium by changing the collocation of Na_(2)SiO_(3),NaOH,KF and NaAlO_(2).The effects of electrolyte composition on the corrosion resistance of the coating were studied.The results show that the regression equations are very significant and the prediction accuracy is high.According to the standardized regression coefficient and Pareto analysis,KF has a great influence on the corrosion resistance corresponding to spot test and electrochemical of the coating.The response surface analysis shows that KF can improve the dropping corrosion resistance of the coating.However,high concentration of KF is not conducive to the improvement of electrochemical corrosion resistance.The main salt Na_(2)SiO_(3)and NaAlO_(2)can obviously improve the electrochemical corrosion resistance of the coating.It can be seen that the difference in the corrosion mechanism between the spotting and electrochemical corrosion resistance is the primary reason for the difference in the effect of the electrolytes on the two indicators.

关 键 词：纯镁 微弧氧化 电解液 单纯形重心设计 回归分析 

分 类 号：TG174.45[金属学及工艺—金属表面处理]