中文摘要：

采用析氢法、失重法、极化曲线和电化学阻抗法测试了L-半胱氨酸对4 mol/L Na OH溶液中AA5052铝合金的缓蚀性能。结果表明：L-半胱氨酸的最佳缓蚀浓度为30 mmol/L;L-半胱氨酸在AA5052铝合金表面的吸附作用符合修正Langmuir曲线;L-半胱氨酸缓蚀剂对AA5052铝合金的缓蚀机理为几何覆盖效应,抑制腐蚀反应的阴极过程,属于阴极型缓蚀剂。

英文摘要：

The corrosion behavior ofAA5052 Al-alloy in 4 mol/L NaOH solution was investigated by means of mass loss method, measurements of hydrogen gas evolution, polarization curve and electrochemical impedance spectroscopy. It was found that the inhibitor of 30 mmol/L L-Cysteine exhibited the optimal corrosion inhibition performance. Moreover, the adsorption of the L-Cysteine on the A1-alloy surface obeyed the amended Langmuir＇s adsorption isotherm. The polarization curves indicated that the L-Cysteine inhibited the cathodic reaction and acted as a cathodic inhibi- tor. The inhibition mechanism was dominated by the geometric covering effect.