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 H2SO4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一个先增大后减小的变化过程。这三种氨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.
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