处理液浓度对铝合金微弧氧化陶瓷膜成膜速率和硬度的影响

分别在Na₂SiO₃, NaAlO₂和(NaPO₃)₆溶液体系中, 研究了处理液种类和浓度对LY12铝合金微弧氧化陶瓷膜微观结构、 成膜速率和显微硬度的影响. 结果表明: 氧化陶瓷膜分表面疏松层和内部致密层, 处理液种类对陶瓷膜的微观结构影响较大, 而同种处理液浓度的变化对其影响不明显; 当处理液浓度小于8 g/L时, 陶瓷膜的成膜速率和显微硬度随处理液浓度的增加而逐渐增加; 当处理液浓度高于8 g/L时, 陶瓷膜的成膜速率和显微硬度随浓度的变化而出现较大的波动, 这种现象符合Albella杂质中心放电模型.

Effects of Treating Solution Concentration on Growth Rate and Microhardness of MAO Coatings on Aluminum Alloy

The effects of treating solution concentration on the microstructure,growth rate,and(microhardness) of Al-alloy MAO coatings,which were prepared in individual Na_2SiO_3,NaAlO_2,and(NaPO_3)_6 solutions,were studied,respectively.The experimental results show that(1) the coating consists of the superficial(porous) layer and the interior compact layer,the coating microstructure is closely related to the treating solution category while the effect of the treating solution concentration on it is unobvious;and(2) the coating growth rate and microhardness increase gradually with the(increased) treating solution concentration when the concentration is less than 8 g/L,but both the growth rate and the microhardness are fluctuating with the increased(solution) concentration when the concentration is more than 8 g/L.This phenomenon accords with Albella's discharge model of(impurity) center.