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分别用失重法、电化学方法和表面分析等手段研究了 ZnBTA 对 6063铝合金在中性 NaCl 溶液中孔蚀的抑制作用。结果表明:在 pH 5—7,Cl~- 浓度为 0.5 mol·L~(-1),ZnBTA 用量大于 0.1m mol·L~(-1)条件下,样品浸泡 1 080 h,缓蚀效率达99％;ZnBTA 既可阻止孔蚀的诱发,又可抑制孔蚀的发展,对电极阴、阳极过程均有明显抑制作用,显示出混合抑制型缓蚀剂的特征。电子探针分析结果证明,ZnBTA 可以阻滞 Cl~-在铝合金表面的吸附聚集过程。通过量子化学计算,分析了ZnBTA 协同效应的可能机理。
The inhibitory effects of ZnBTA on the pitting corrosion of 6063 aluminum alloy in neutral NaCl solution were investigated by weight loss method, electrochemical method and surface analysis. The results showed that under the conditions of pH 5-7, Cl ~ - 0.5 mol·L -1 and ZnBTA> 0.1 m mol·L -1, the samples were soaked for 1 080 h, the corrosion inhibition efficiency was 99%. ZnBTA can not only prevent the pitting induced, but also inhibit the development of pitting corrosion. It has a significant inhibitory effect on the cathode anodic process and shows the characteristics of the mixed inhibitor inhibitor. Electron probe analysis results show that ZnBTA can block Cl ~ - adsorption on the aluminum alloy surface aggregation process. Through quantum chemical calculation, the possible mechanism of ZnBTA synergistic effect is analyzed.