AZ91D镁合金用复合缓蚀剂缓蚀行为的研究

摘要

采用腐蚀试验、电化学极化曲线和交流阻抗谱对自主研发的用于抑制镁合金在3.5％NaCl溶液中腐蚀的有机-无机复合缓蚀剂的缓蚀性能和缓蚀机理进行了研究.实验结果表明,在3.5％NaCl溶液中添加复合缓蚀剂的质量分数为3％时,其缓蚀效果最好,缓蚀效率高达91％,此时AZ91D镁合金的静态腐蚀速度小于0.06 g/(m2·h)；复合缓蚀剂同时抑制了镁合金腐蚀的阴极和阳极过程,且以阳极抑制作用为主.%The corrosion performance and mechanism of the composite inhibitor -was investigated by corrosion weight loss method, Tafel polarization curves and electrochemical impedance spectra. The results showed that the inhibition effect was the best with efficiency up to 91% when the mass fraction of inhibitor was 3 % in 3.5 % NaCl solution, and the static corrosion rate was less than 0.06 g/ (m2 · h). Both the cathode and anode corrosion process of AZ91D magnesium alloy were inhibited by the composite inhibitor and the anode inhibition was the main inhibition.