合成了三种半胱氨酸衍生物, 运用红外光谱对其结构进行了表征。采用失重法极化曲线法和电化学阻抗法研究了三种半胱氨酸衍生物对酸洗碳钢的缓蚀行为。失重试验结果表明, 缓蚀率由大到小的顺序为S-苄基半胱氨酸>S-己基半胱氨酸>S-丁基半胱氨酸, 当前两者浓度为800 mg/L时缓蚀率都达到了98%以上。极化曲线表明, S-苄基半胱氨酸和S-丁基半胱氨酸均为混合型缓蚀剂, S-己基半胱氨酸在低浓度(50 mg/L)时为阴极型缓蚀剂, 高浓度(>50 mg/L)时为抑制阴极为主的混合型缓蚀剂; 电化学阻抗测试表明碳钢表面电荷转移电阻随缓蚀剂浓度增加而增大。

Three kinds of cysteine derivatives were synthesized and their structures were identified by infrared spectroscopy. The inhibition efficiencies of the three inhibitors were studied by weight-loss method and electrochemical impedance spectroscopy (EIS) .The results of weight-loss show that the inhibition rate was S-benzyl-cysteine > S-hexyl-cysteine > S-butyl-cysteine. The inhibition efficiencies of the first two were above 98% at 800 mg/L. The results of polarization curves indicated that S-benzyl-cysteine and S-butyl-cysteine functioned as mixed-type inhibitor. S-hexyl-cysteine was cathodic inhibitor at low concentration and mixed-type inhibitor at high concentration. The results of EIS show that the charge transfer resistance of metal surface increased with the inhibitor concentration increasing.