硫酸介质中含硫氨基酸缓蚀性能研究

STUDY OF THE SULFUR-CONTAINING AMINO'S STRUCTURE AND CORROSION INHIBITION MECHANISM IN H_2SO_4

用电化学测试和量子化学计算法研究L-甲硫氨酸、L-胱氨酸及L-半胱氨酸在1 mol/L H_2SO_4体系中的缓蚀性能和缓蚀机理。结果表明,在0.1 mmol/L～0.1 mol/L浓度范围内,随浓度的增加,L-甲硫氨酸和L-半胱氨酸的缓蚀效率均增大,而L-胱氨酸的缓蚀效率存在～个先增大后减小的变化过程。这三种氰基酸在碳钢表面的吸附机理是氨基酸提供电子,Fe提供空轨道,两者以配位键键合。

Electrochemical testing,and quantum chemistry calculations were used to study the corrosion inhibition mechanism of L-methionine,L-cystine,L-cysteine in 1 mol/L sulfuric acid system.The results of linear polarization,Tafel extrapolation and EIS showed that inhibition efficiency of L-methionine and cysteine increased with the increase of the concentration among 0.0001 mol/L～0.1 mol/L.And these three amino acids adsorption in carbon steel is provided by the amino acids to provide electronic,air-rail track,two coordination bonds to bonding.