癸酸咪唑啉季铵盐缓蚀剂对HEDP体系的缓蚀与阻垢性能影响

Influence of Decanoic Acid Imidazoline Quaternary Ammonium Salt Corrosion Inhibitor on Corrosion and Scale Inhibition Performance of HEDP System

以癸酸,二乙烯三胺以及氯化苄为原材料反应得到癸酸咪唑啉季铵盐(DI)缓蚀剂。采用失重法、扫描电镜(SEM)以及电化学测试等评价了DI缓蚀剂在1%(质量分数)羟基乙叉二膦酸(HEDP)溶液中对N80钢的缓蚀性能。结果表明:当DI质量浓度为400 mg/L时,缓蚀率达到74.94%。采用静态沉积法研究了DI对1%HEDP体系中碳酸钙的阻垢性能。结果显示,DI的加入提升了HEDP对碳酸钙垢的阻垢效果。当DI的质量浓度为600 mg/L时,阻垢效率可达93.64%,相较于未加DI时,提高了10%左右。通过分子动力学模拟研究了DI和HEDP在方解石(104)和(102)两个晶面的吸附行为。

Decanoic acid imidazoline quaternary ammonium salt(DI)corrosion inhibitor was obtained by reaction using decanoic acid,diethylenetriamine,and benzyl chloride as raw materials.The corrosion inhibition performance of DI on N80 steel in a 1%hydroxyethylenediphosphonic acid(HEDP)solution was evaluated by weight loss mothod,SEM,and electrochemical testing.The results show that when the DI concentration was 400 mg/L,the corrosion inhibition rate reached 74.94%.The scale inhibition performance of DI on calcium carbonate in 1%HEDP system was studied using static deposition method.The results show that the addition of DI improved the scale inhibition effect.When the concentration of DI was 600 mg/L,the scale inhibition efficiency could reach 93.64%,which was about 10%higher than when DI didn′t add.The adsorption behavior of DI and HEDP on the crystal planes of calcite(104)and(102)was studied through molecular dynamics simulation.