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在40℃的0.5M Na_2SO_4溶液中,以动电位极化曲线测定考察了邻、间、对一氨基苯甲酸和苯甲酸对铁的缓蚀作用。在pH值为5~8的范围内,以邻-氨基苯甲酸的缓蚀作用最强,缓蚀率随溶液中邻氨基苯甲酸浓度的增加而提高。同时,随浓度增加,由于其对铁的阳极溶解反应的强烈抑制作用,腐蚀电位大幅度地正向移动。当铁浸入含邻氨基苯甲酸的溶液中后,其表面可观察到生成了一层浅绿色的沉积物膜。并发现膜的厚度与
The corrosion inhibition of iron by o-aminobenzoic acid and benzoic acid was investigated by potentiodynamic polarization curve in 0.5 M Na 2 SO 4 solution at 40 ℃. In the range of pH value from 5 to 8, the inhibition of ortho-aminobenzoic acid was the strongest, and the corrosion inhibition rate increased with the increase of the concentration of anthranilic acid in solution. At the same time, as the concentration increases, the corrosion potential shifts greatly in the positive direction due to its strong inhibitory effect on the anodic dissolution of iron. When iron was immersed in a solution containing anthranilic acid, a pale green sediment film was observed on the surface of the iron. And found that the thickness of the film