碱性溶液中L-半胱氨酸对AA5052铝合金阳极缓蚀作用研究  

Corrosion Inhibition of L-Cysteine for AA5052 Al-alloy Anode in Alkaline Solution

作　　者：王大鹏[1] 高立新[1] 张大全[1] 

机构地区：[1]上海电力学院环境与化学工程学院,上海200090

出　　处：《中国腐蚀与防护学报》2015年第4期311-316,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(20776083和20911140272)资助

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。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.

关 键 词：缓蚀剂 AA5052铝合金 L-半胱氨酸 NAOH溶液 

分 类 号：TG172.6[金属学及工艺—金属表面处理]