季铵化聚乙烯亚胺对低碳钢缓蚀性能与机理  

Corrosion Inhibition of Quaternary Polyethyleneimine For Low Carbon Steel

作　　者：张昕[1] 高保娇[1] 申艳玲[1] 

机构地区：[1]中北大学化学工程系,太原030051

出　　处：《应用化学》2008年第2期212-217,共6页Chinese Journal of Applied Chemistry

基　　金：山西省自然基金(20040402)资助项目

摘　　要：采用叔胺化反应与季铵化反应2步高分子反应过程,制备季铵化的聚乙烯亚胺(QPEI),采用静态挂片失重法与电化学极化曲线测定法,研究了在H2S04溶液中QPEI对低碳钢的缓蚀性能与缓蚀机理,并使用扫描电子显微镜对缓蚀样片表面膜层进行了分析。实验结果表明,QPEI对低碳钢具有优良的缓蚀作用,在0.5mol/L的H2S04介质中,QPEI的质量浓度仅为5mg/L,A3钢片的腐蚀时间为72h时,缓蚀率高达91%;QPEI可同时抑制阴极过程与阳极过程,其缓蚀作用属混合型;在物理吸附与化学吸附的协同下,QPEI在碳钢表面会形成致密的吸附膜,它在钢板表面的吸附行为符合Langmuir单分子层吸附等温式。Quaternary Polyethyleneimine （QPEI） was prepared via two steps of polymer reaction, tertiary amination and quaterisation, and the corrosion inhibition property and mechanism of QPEI for low carbon steel dipped in aqueous solution of H2SO4 of 0. 5 mol/L were investigated by mass-loss method, electrochemical polarization measurement, and scanning electron microscopy. The experiment results showed that QPEI possessed excellent corrosion inhibition property, and at a concentration of 5 mg/L, the corrosion inhibition rate was up to 91% for A3 steel sample which had been dipped in sulfuric acid medium of 0. 5 mol/L for 72 h. QPEI can simultaneously hinder cathode process and anode process, so its corrosion inhibition belongs to the mixed type. With the synergistic action of physics and chemistry adsorptions, QPEI can produce compact and dense film on the steel surface. The adsorption of QPEI on the surface of low carbon steel obeyed Langmuir equation.

关 键 词：聚乙烯亚胺 季铵盐 缓蚀作用 缓蚀机理 

分 类 号：O646.6[理学—物理化学] O631.4[理学—化学]