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1.4-二(1'-硫氰铵基乙基-2'-咪唑啉基)苯缓蚀剂的合成及其缓蚀性能的研究 被引量:2

Research on the synthesis and performance of 1. 4-di( 1'-ethyl ammonium thiocyano-2'-imidazolinyl) benzene corrosion inhibitors
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摘要 以对苯二甲酸和二乙烯三胺为原料,采用阶梯升温法合成了1.4-二(1'-胺乙基-2'-咪唑啉基)苯中间体,通过正交实验法,研究了中间体与硫脲高温重排反应合成了1.4-二(1'-硫氰铵基乙基-2'-咪唑啉基)苯的最优合成条件。采用元素分析和红外光谱表征了产物的结构。正交实验得到的最佳合成条件为:中间体与硫脲的摩尔比为1∶2.2,温度为150℃,溶剂为N,N-二甲基甲酰胺,反应时间为4 h,产率为77.2%。采用静态失重法和电化学极化曲线法研究了该缓蚀剂的缓蚀性能,静态失重缓蚀实验结果表明,在5%盐酸介质中,药剂用量为100 mg/L、酸性介质温度为60℃、腐蚀时间为6 h的实验条件下,对Q235钢缓蚀率为93.7%。电化学极化曲线测定结果表明,缓蚀剂是一种阴极型缓蚀剂。吸附热力学研究表明,该缓蚀剂的吸附等温线符合Langmuir吸附等温式。 Terephthalic acid and diethylenetriamine were used to synthesize 1. 4-di( 1'-aminoethyl-2'-imidazolinyl) benzene intermediate by raising the temperature in stages,looking for the optimum condition of the high temperature shift reaction between intermediate and thiourea through orthogonal test synthesis1. 4-di( 1'-ethyl ammonium thiocyano-2'-imidazolinyl) benzene. The composition and structure of the products were confirmed by FTIR and elemental analysis. The orthogonal experiment results showed that the optimum synthetic condition was 1∶ 2. 2 of the raw material molar ratio of intermediate and thiourea,with DMF as a solvent,reacting for 4 h at 150 ℃,which the yield is 77. 2%. Besides,the corrosion inhibition effect was carried out through static weight loss method and electrochemical polarization curves.Static weightlessness corrosion tests have been done at 60 ℃,5% hydrochloric acid medium,6 h of reaction time and amount of 100 mg / L. Under these reaction conditions,the rate of anti-corrosive efficiency for Q235 is 93. 7%. The electrochemical experiment approved the corrosion inhibitoracted as an cathodic type inhibitors of metal. The adsorption of the corrosion inhibitor on the Q235 steel surface in an acidic solution conformed with the Langmuir adsorption isotherm equation.
出处 《应用化工》 CAS CSCD 北大核心 2017年第1期96-100,共5页 Applied Chemical Industry
基金 广东省科技计划项目(2014A020216040)
关键词 缓蚀剂 对苯二甲酸 硫氰酸盐 双咪唑啉 电化学 corrosion inhibitor terephthalic acid thiocyanate bis-imidazoline electrochemistry
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