甲酸水溶液体系中减缓金属腐蚀的缓蚀剂的研究

Study on Inhibitor for Reducing Metal Corrosion in Formic Acid Solution

为降低酸性脱漆剂对飞机金属材料的腐蚀,以脱漆剂中经常使用的甲酸水溶液为研究介质,以AIL4130、TC4、LY12、20#钢等材料为研究对象,通过腐蚀失重法、塔菲尔曲线测量和SEM观察,筛选出对以上各金属材料缓蚀效果较好的复配缓蚀剂体系,即苯甲酸钠、硫脲、六次甲基四胺、十二烷基磺酸钠、苯并三氮唑等缓蚀剂的优化组合。缓蚀效率分别为:AIL4130 95.73%;TC4 88.49%;LY12 92.47%;20#钢86.49%。金属的失重和点蚀深度低于飞机用金属材料腐蚀允许量的相关标准。

In order to reduce the corrosion of acidic paint stripper to aeronautical metals and provide with better anti-corrosion additive for AIL4130, TC4, LY12, and 20^# steel, a series of inhibitors and their composite were investigated. Weight loss experiment, Tafel curves measurement and SEM observation were carried out for the above metals in the formic acid solution which was normally used in the paint stripper. The experimental results indicate that the optimizing composite inhibitor consists of sodium benzoate, 2-thiourea, hexamethylenetetramine, sodium laurylsulfonate and 1,2,3- benzotriazole. The anti-corrosion efficiency for AIL4130, TC4, LY12 and 20^# steel is 95.73% , 88.49% , 92.47%, 86.49% respectively. The weight loses of the four metals and the pitting depth are far lower than the related standard of the material corrosion of airplane metal.