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首页> 外文期刊>Corrosion Engineering, Science and Technology >Novel class of bisquaternary ammonium salts in inhibition of mild steel corrosion in HCl and H_2SO_4
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Novel class of bisquaternary ammonium salts in inhibition of mild steel corrosion in HCl and H_2SO_4

机译：新型的双季铵盐类在HCl和H_2SO_4中抑制低碳钢腐蚀

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摘要

A series of new bisquaternary ammonium inhibitor molecules p-xylylenebis[trialkylammonium chloride] were prepared in excellent yields by reacting α,α'-dichloro-p-xylene with a group of tertiary amines such as N,N-diallyl-N'-formyl-1,12-diaminododecane, N,N-diallyl-, N,N-diethyldo-decylamine and N-dodecylpyrrolidine. Inhibition efficiencies (IEs) for different concentrations of bisquaternary salts for the inhibition of corrosion of mild steel in 1, 4 and 7.7M HCl as well as 0.5M H_2SO_4 exposed for 6 h at 60℃ were determined gravimetrically. While in the presence of 400 ppm all the inhibitor molecules exhibited excellent %IEs of ≥99 in 1M HCl, p-xylylenebis[N,N-diallyl, N-dodecylammonium chloride] provided very good %IE of 97 and 94 respectively in 4 and 7.7M HCl. The inhibitors imparted good to very good IE in arresting mild steel corrosion in 0.5M H_2SO_4; p-xylylenebis[N,N-diallyl, N-dodecylammonium chloride] performed the best, giving %IE of 94 at 400 ppm. The interactions of the φ electrons in the diallyl moiety with the low lying vacant d orbitals of iron help the inhibitor molecules to undergo adsorption and interfere with the anodic dissolution process. Comparable results for the IEs were obtained by the electrochemical method using Tafel plots of the synthesised compounds. The adsorption of these compounds on the mild steel surface was found to obey Frumkin and Temkin adsorption isotherms in 1M HCl and 0.5M H_2SO_4 respectively.
机译：通过使α，α'-二氯-对二甲苯与一组叔胺（例如N，N-二烯丙基-N'-甲酰基）反应，以优异的收率制备了一系列新的双季铵盐抑制剂分子对二甲苯基双[三烷基氯化铵] -1，12-二氨基十二烷，N，N-二烯丙基-，N，N-二乙基十二烷基胺和N-十二烷基吡咯烷。用重量分析法测定了不同浓度的双季铵盐对缓蚀低碳钢在1、4和7.7M HCl以及0.5M H_2SO_4在60℃下的腐蚀的抑制效率（IEs）。在400 ppm的存在下，所有抑制剂分子在1M HCl中均显示出≥99的极佳％IE，而对二甲苯基双[N，N-二烯丙基，N-十二烷基氯化铵]在4和6中分别提供了非常好的97％和94％ 7.7M HCl。抑制剂在阻止0.5M H_2SO_4中的轻度钢腐蚀方面，对良好的IE具有良好的抑制作用;对二甲苯基双[N，N-二烯丙基，N-十二烷基氯化铵]表现最好，在400 ppm时的％IE为94。二烯丙基部分中的φ电子与铁的低空位d轨道的相互作用有助于抑制剂分子吸附并干扰阳极溶解过程。 IE的可比较结果通过电化学方法使用合成化合物的Tafel图获得。发现这些化合物在低碳钢表面上的吸附分别遵守在1M HCl和0.5M H_2SO_4中的Frumkin和Temkin吸附等温线。

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