摘要
本文在合成1-(2-氨乙基)-2-十五烷基咪唑啉(A)的基础上,利用硫代氨基脲对其进行改性,制备了一种1-(2-氨基-硫脲乙基)-2-十五烷基咪唑啉(B)新型缓蚀剂。通过失重法和电化学方法研究了A、B两种缓蚀剂在H2S、CO2共存条件下对Q235钢的缓蚀性能,探讨了其在Q235钢表面的吸附行为。结果显示,改性后的缓蚀剂B具有更优的抗H2S、CO2腐蚀的缓蚀性能,最高缓蚀效率在92%以上。两者在Q235钢表面均是单分子层吸附,属于以化学吸附为主的混合吸附。最后采用量子化学方法对两种缓蚀剂的缓蚀机理进行了分析。
A newly imidazoline compound, 1-（2-amido-thioureaethyl）-2-pentadecyl-imidazoline（B） was synthesized by modified using thiosemicarbazide on the basis of 1-（2-aminoethyl）-2-pentadecyl- imidazoline（A）. The corrosion inhibition performances and adsorption behaviors of A and B were investigated as corrosion inhibitor for Q235 steel corrosion in H2S/CO2 coexistence solution using weight loss measurements and electrochemical methods. The results indicated that the modified compound B has better corrosion inhibition performance in H2S and CO2 corrosion enviroment, to Q235 steel corrosions, and the highest inhibition efficiency is up to more than 92%. It was found that the adsorptions of two compounds on Q235 steel can be fitted to Langmuir isotherm equation, and belong to mix-type adsorption which mainly dominated by chemisorptions. The inhibition mechanism of two compounds have been investigated by density functional theory （DFT） of quantum chemical calculations.
出处
《全面腐蚀控制》
2012年第12期40-44,共5页
Total Corrosion Control
关键词
缓蚀剂
失重法
电化学测试
量子化学
corrosion inhibitor
weight loss measurement
electrochemical measurement
quantum chemical
