H_2S水溶液中的腐蚀与缓蚀作用机理的研究 Ⅵ.H_2S溶液中咪唑啉衍生物分子结构与其缓蚀性能的关系  

STUDY ON CORROSION AND INHIBITION MECHANISM IN H_2S AQUEOUS SOLUTIONS Ⅵ.The Relationship between Molecular Structure of Imidazoline Derivatives and Inhibition Performance 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》2002年第3期148-152,共5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：利用交流阻抗、极化曲线和腐蚀失重法 ,在H2 S溶液中研究了咪唑啉分子结构的变化与其缓蚀性能间的关系 .结果表明 :位于中心咪唑环 1,2位置上憎水和亲水支链长短结构的变化 ,极性官能团的存在对其缓蚀性能均具有较大的影响 .当憎水支链碳原子为 7和 17时 ,化合物具有较好的缓蚀性能 ;憎水支链中双键的存在 ,可有效提高化合物的缓蚀性能 ,而羟基基团的引入 ,对其缓蚀性能却没有明显的改进 .当亲水支链中含有两个氨基乙撑基团时 ,化合物缓蚀效果最好 ,硫脲基团的存在 ,也可有效提高咪唑啉化合物的缓蚀性能 .咪唑环本身化学性质的改变 ,虽可改善其缓蚀性能 。The relationship between molecular structure of imidazoline derivatives and inhibition performance was investigated by weight loss method,potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS) in H 2S solutions.Result show that the side chains,which occupies 1 or 2 sites on the central five membered ring and has hydrophobic or hydrophilic properties,and some active functional groups have an important effect on the inhibition performance of imidazoline derivatives.Compounds studied have the best inhibitive efficiency when the hydrophobic side chain contains either seven or seventeen carbon atoms,and the best inhibitive efficiency when the hydrophilic side chain contains two aminoethylenes.The double bond in the hydrophobic side chain and the thiourea group in the hydrophilic side chain can effectively enhance inhibitive performance,nor can the hydroxyl group in the hydrophobic chain.Although the inhibitive performance of imidazoline derivates can be improved through changing the central imidazoline ring chemistry,they do not suit to use as inhibitor because of the poor solubility.

关 键 词：咪唑啉 分子结构 缓蚀性能 H2S腐蚀 缓冲剂 

分 类 号：TG174.42[金属学及工艺—金属表面处理]