Corrosin inhibition performrnce of bis(1-chloro-N-hydroxyethyl morpholinium-2-hydroxypropyl) n-octadecylamine

doi:10.16085/j.issn.1000-6613.2017-1162

Abstract

Abstract: The corrosin inhibition and adsorption behavior of bis(1-chloro-N-hydroxyethyl morpholinium-2-hydroxypropyl) n-octadecylamine on A3 steel were studied using weight loss method,polarization curve,electrochemical impedance spectroscopy,and atomic force microscope. The results showed that the corrosion inhibition effect of bis(1-chloro-N-hydroxyethyl morpholinium-2-hydroxypropyl) n-octadecylamine at a mass concentration of 0.4g/L and a temperature of 45℃,the corrosion inhibition rate is 91.32%,and the corrosion rate decreased with increasing acid concentration. Polarization curve test results showed that morpholine quaternary ammonium salt was a cathode-based mixed corrosion inhibitor. The physical adsorption behavior of bis(1-chloro-N-hydroxyethyl morpholinium-2-hydroxypropyl) n-octadecylamine on the surface of steel sheet was in accordance with the Langmuir adsorption isotherm,which is based on chemical adsorption. The corrosion process of A3 steel in hydrochloric acid solution was spontaneous,endothermic,and accompanied by the entropy increase.

Key words: corrosion inhibitor, morpholine, corrosion inhibition mechanism, adsorption behavior, Langmuir adsorption isotherm

摘要： 采用失重法、极化曲线、电化学阻抗谱和原子力显微镜等分析方法研究了实验室自制的双（1-氯-N-羟乙基吗啉鎓-2-羟丙基）正十八烷胺对A3钢的缓蚀性能，并探讨了其在钢片表面的吸附行为。失重法结果表明，双（1-氯-N-羟乙基吗啉鎓-2-羟丙基）正十八烷胺在质量浓度为0.4g/L、温度为45℃时其缓蚀效果良好，缓蚀率达到91.32%，并且随着酸浓度的增大缓蚀率减小。极化曲线测试结果表明双（1-氯-N-羟乙基吗啉鎓-2-羟丙基）正十八烷胺属于以抑制阴极为主的混合型缓蚀剂。双（1-氯-N-羟乙基吗啉鎓-2-羟丙基）正十八烷胺分子在钢片表面的物理吸附行为符合Langmuir吸附等温式，是以化学吸附为主结合物理吸附的混合吸附；A3钢在盐酸溶液中的腐蚀反应过程是自发的、吸热的，并伴随着熵增。

关键词: 缓蚀剂, 吗啉, 缓蚀机理, 吸附行为, Langmuir吸附等温式

CLC Number:

O626.4

GUO Rui, MA Lan, WANG Yingyue, LI Yunpeng, TU Ruixiang, SONG Bo, GUO Yu. Corrosin inhibition performrnce of bis(1-chloro-N-hydroxyethyl morpholinium-2-hydroxypropyl) n-octadecylamine[J]. Chemical Industry and Engineering Progress, 2018, 37(03): 1145-1151.

郭睿, 马兰, 王映月, 李云鹏, 土瑞香, 宋博, 郭煜. 双(1-氯-N-羟乙基吗啉鎓-2-羟丙基)正十八烷胺的缓蚀性能[J]. 化工进展, 2018, 37(03): 1145-1151.

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