硫酸介质中二硫代氨基甲酸钠对碳钢的缓蚀机理  

Inhibiting Mechanism of Sodium Dithiocarbamate to the Corrosion of Mild Steel in Sulfuric Acid

作　　者：范洪波[1] 胡勇有[2] 郑家燊[3] 

机构地区：[1]东莞理工学院化学生物工程系,广东东莞523808 [2]华南理工大学环境科学与工程学院,广东广州510640 [3]华中科技大学化学系,湖北武汉430074

出　　处：《华南理工大学学报（自然科学版）》2005年第6期55-58,共4页Journal of South China University of Technology(Natural Science Edition)

基　　金：教育部博士后科学基金资助项目(2004035027)

摘　　要：为探讨二硫代氨基甲酸钠缓蚀剂在硫酸中对碳钢的缓蚀机理,以胺和CS2为起始反应物,制备出一系列二硫代氨基甲酸盐类缓蚀剂,进行了红外光谱分析.采用失重法和电化学方法对该缓蚀剂在硫酸中对碳钢的缓蚀作用进行实验.结果表明:二硫代氨基甲酸钠在浓度为0.5mol/L的H2SO4中对碳钢表现出较好的缓蚀性能;在硫酸溶液中,随二硫代氨基甲酸钠缓蚀剂浓度的增加,缓蚀效率相应提高;在H2SO4介质中,二硫代氨基甲酸钠是一个混合型缓蚀剂,氮原子上取代基不同对二硫代氨基甲酸盐类缓蚀剂的缓蚀效率影响较大.In order to investigate the inhibiting mechanism of sodium dithiocarbamate (DTC) to the corrosion of mild steel in sulfuric acid, a series of dithiocarbamate corrosion inhibitors were synthesized by using amine and CS_2 as the reactants and were then characterized by IR spectra. Moreover, the inhibition effect of DTC to mild steel in sulfuric acid was investigated by means of the weight loss and the electrochemical methods. The results indicate that DTC can obviously inhibit the corrosion of mild steel in 0.5mol/L H_2SO_4 solution, with the inhibition efficiency increasing with the concentration of DTC. It is also indicated that DTC behaves as a mixed-type corrosion inhibitor whose inhibition efficiency is significantly influenced by the various substituting groups on nitrogen atoms.

关 键 词：硫酸 二硫代氨基甲酸钠 碳钢 缓蚀剂 

分 类 号：TG174.42[金属学及工艺—金属表面处理]