缓蚀剂阳极脱附的动力学研究

缓蚀剂阳极脱附的动力学研究 A Kinetic Study on the Anodic Desorption of Interface Corrosion Inhibitor 汪的华 WANG Di\|hua 1 first-author 江俊伟 JIANG Jun\|wei 1 卜宪章 BU Xian\|zhang 1 甘复兴 GAN Fu\|xing 1 邹津耘 ZOU Jin\|yun 1 武汉大学化学与分子科学学院,湖北,武汉,430072 武汉大学化学与分子科学学院,湖北,武汉,430072 College of Chemistry and Molecular Science, Wuhan University College of Chemistry and Molecular Science, Wuhan University 运用极化曲线、微分极化曲线、循环极化和恒电位暂态等方法研究了缓蚀剂阳极脱附的动力学行为 ,结果表明 :缓蚀剂阳极脱附存在一个明显的诱导期 ,具有“S”型的脱附动力学曲线 ,呈自催化反应特征 ;外加电位越正 ,缓蚀剂脱附速度越快 ,脱附的诱导期越短 ;覆盖度高的稳定吸附层 ,脱附电位更正 ,脱附速度也更快 .据此提出了缓蚀剂的阳极脱附是由于阳极极化条件下电极过程吸附态中间产物的竞争吸附使得缓蚀剂发生自加速脱附的新机制 The kinetics of inhibitor desorption on iron surface were investigated by potentiodynamic, differential polarization curve, cyclic polarization experiment, as well as potential step method. It was found that the anodic desorption exists an incubation time, and the measured kinetic curves of inhibitor desorption are “S” type, showing an autocatalytic process. The desorptin rate is depended on the desorption potential as well as the stability of inhibitor adsorption. The more stable the adsorption of inhibitoris, the more positive the E des and the faster the desorption rateis. A new desorption mechanism was proposed on the basis of experimental results. According to this mechanism, the anodic desorption of inhibitor is more probably due to the competitive adsorption between inhibitor and intermediate produced in the anodic dissolution process of iron. 缓蚀剂 阳极脱附 脱附动力学 脱附机制 corrosion inhibitors anodic desorption desorption kinetics desorption mechanism TG174.42 国家自然科学基金! （5 980 10 0 7）;金属腐蚀与防护国家重点实验室资助课题 2001-02-01 2021-04-01 2