HCl溶液中苯并咪唑类化合物对低碳钢的缓蚀性能研究

摘要

采用失重法和量子化学计算法对2-苯基苯并咪唑（PBI）、N,N-二（2-甲基苯并咪唑）胺（BMA）和N,N,N,N-四（2-甲基苯并咪唑）胺（EDTB）在盐酸介质中对低碳钢的缓蚀作用及其机理进行了研究。结果表明,三者均具有较为优良的缓蚀作用,原因在于苯并咪唑环具有更大的共轭体系而易于被吸附于低碳钢的表面,形成致密的保护涂层,量子化学计算的结果也表明苯并咪唑环为吸附的活性点,并进一步对缓蚀性能较为稳定的EDTB进行了研究。%The corrosion inhibition of 2-phenyl benzimidazole(PBI),N,N-bis(2-methyl benzimidazole)amine(BMA) and N,N,N,N-tetrakis(2-methyl benzimidazole)amine(EDTB) to the low steel in the hydrochloric acid had been studied by weight loss method,the electro-chemical analysis and quantum chemical calculation.It was found that all of them possess relatively good corrosion inhibition,among them EDTB is more stable one.The mechanism investigation indicated that the presence of the large conjugated benzimidazole ring in the molecules can offer the active sites of adsorption to make the formation of the protective layer on the steel surface easily.