Influence of alkyl group of imidazolinyl-quaternary-ammonium-salt on corrosion inhibition efficiency^①

来源期刊：中南大学学报(英文版)2006年第4期

论文作者：石顺存 王学业 易平贵 曹晨忠 邓彤彤 苏界殊

文章页码：393 - 398

Key words：imidazolinyl-quaternary-ammonium-salt; corrosion inhibition efficiency; quantum chemistry; weight loss method

Abstract: The action between imidazolinyl-quaternary-ammonium-salt(IQAS) molecule and Fe atom was studied,and the influence of the alkyl group connected with N atom of imidazoline ring on corrosion inhibition efficiency was explored. Quantum chemical methods, HF/6 31 G and HF/Lan L2 dz, were applied successively to calculate the parameters such as front molecular orbit energy of IQASⅠ Ⅳand chemical adsorption for IQASⅠ Ⅳand Fe atom.The corrosion inhibition efficiency was measured with the weight loss method of carbon steel samples in acidic solution and oil field sewage. Based on the theoretical analyses and experimental results, it is concluded that N-Fe coordination bond is formed between IQAS molecule and Fe atom, corrosion inhibition efficiency is decreased in the following order(from large to small): IQASⅣ, IQASⅢ, IQASⅡ, IQASⅠ.