H_2S水溶液中的腐蚀与缓蚀作用机理的研究 ⅷ 咪唑啉衍生物在H_2S溶液中的吸附作用行为  

STUDY ON CORROSION AND INHIBITION MECHANISM IN H_2S AQUEOUS SOLUTIONS ⅷ.The adsorption behavior of imidazoline derivates on the mild steel electrodes in H_2S solutions

作　　者：杨怀玉[1] 陈家坚[1] 曹楚南[1] 曹殿珍[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《中国腐蚀与防护学报》2003年第2期75-78,共4页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点基础研究专项经费资助 (G19990 65 0 )

摘　　要：依据咪唑啉衍生物在H2 S溶液中的腐蚀电化学研究结果 ,分析探讨了系列咪唑啉化合物在碳钢电极表面的吸附作用规律及可能的吸附状态 ,并建立了该类化合物可能的吸附模型 .结果表明 ,研究的 13种咪唑啉衍生物的吸附均符合Langmuir单分子等温吸附规律 ,为具有较大表面吸附自由能的化学吸附 ;这种吸附主要来自分子中不饱和五元环与金属表面的强烈作用 .其可能的吸附方式是分子中咪唑环以近似平行金属表面的取向同金属表面发生相互作用 ,亲水支链骨架原子的奇偶性对分子的吸附作用方式具有重要影响 。The adsorption behaviors of some imidazoline derivates on the surface of mild steel electrodes was investigated based on the results of electrochemical test in H 2S solutions,a protable adsorption model was suggested as well.Results show that all of 13 kinds of imidazoline derivates follow Langmuir isotherm and the interaction between the inhibitor molecule and the surface of electrodes is a strong chemical action with a high Gibbs adsorption free energy,which is primarily from the bonding between the unsaturated pentagonal nitrogen ring and the surface of metal.The pentagonal ring in imidazoline derivate molecule interacts approximately parallel to the metal surface.The number of skeleton atoms in hydrophilic chain plays an important role in adsorption to the metal surface,as well as the change of hydrophobic chain has a less contribution to the molecular adsorption.

关 键 词：硫化氢水溶液 腐蚀 缓蚀机理 咪唑啉衍生物 吸附 

分 类 号：TG174.42[金属学及工艺—金属表面处理]