硫酸介质中天冬氨酸及天冬酰胺对N80碳钢的缓蚀性能

Inhibition Performance of D-Aspartic Acid and L-Asparagine for N80 Steel in Sulfric Acid Solution

通过极化曲线、交流阻抗法等电化学测试方法,研究天冬氨酸和天冬酰胺2种氨基酸作为缓蚀剂在0.1 mol.L-1硫酸中对N80碳钢的缓蚀性能.研究结果表明:上述2种缓蚀剂在较低浓度的情况下均具有较好的缓蚀性能,天冬氨酸缓蚀效率最高达79.2%,而天冬酰胺缓蚀效率最高达81.8%,天冬酰胺结构上的酰基能够提供极性基团,在金属表面形成吸附薄膜,使其表现出更高的缓蚀效率;且缓蚀效率均随缓蚀剂浓度的增加而增大;2种缓蚀剂都属于阴极型缓蚀剂,且天冬酰胺的缓蚀效果更好.

The inhibition effect of D-Aspartic Acid and L-Asparagine on the corrossion of N80 steel in sulfric acid solution（0.1 mol · L-1） was investigated using polarization techniques and celectrochemical impedence（EIS）.The study showed that the inhibitiors had promising corrossion inhibition efficiency at low concentration,the inhibition efficiency of D-Aspartic Acid reached 79.2 % and the inhibition efficiency of L-Asparagine reached 81.8 %,the acyl group of the structure of L-Asparagine could provide polar group that could form thin form to put up the higher inhibition efficiency.The inhibition efficiency（IE,%） increased with the concentration of inhibitors increasing.L-Asparagine acid was more efficient than D-Aspartic acid,and polarization curves revealed that inhibitors were all negative type of inhibitors.