中文摘要：

设计正交实验制备了一种新型的月桂酸二乙醇酰胺缓蚀剂，研究了其对碳钢的缓蚀性能并探索其缓蚀机理。结果表明，月桂酸二乙醇酰胺的产率可达87．4％，最佳合成条件为：反应温度130℃，反应物摩尔比（月桂酸：二乙醇胺）1：2．5，反应时间5h。通过失重法研究了不同月桂酸二乙醇酰胺浓度下碳钢的腐蚀速率，发现200mg／kg浓度时缓蚀效果最好。结合扫描电镜以及Tafel极化曲线，分析了这一缓蚀剂的作用机理在于吸附于金属表面形成有机保护膜，并且使金属极化，抑制腐蚀作用。

英文摘要：

On the basis of orthogonal experiments, laurel acid diethanolamide as a novel corrosion inhibitor was synthesized via a facile route. The corrosion -inhibiting performance and potential mechanism were investigated. The results of orthogonal experiments showed that the yield rate of laurel acid diethanolamide can be up to 87.4% at optimal conditions ： reaction temperature was 130℃, moral ratio of laurel acid to diethanol was 1 ： 2.5, and reaction time was 5 h. It was found that the optimal corrosion - inhibiting performance could be achieved when the concentration of laurel acid diethanolamide was at 200 mg/kg. Based on the observation using scanning electronic microscope and the measurement of Tafel polarization curves using electrochemical method, the mechanism of the novel inhibitor was demonstrated. It indicated the laurel acid diethanolamide could adsorbed on the surface of steel to form a organic molecule film to protect the steel, as well as polarize the metal, and thereby inhibiting the corrosion of steel effectively.