新型油酸基咪唑啉酰胺对A3碳钢的缓蚀性能研究

针对高酸原油加工中分馏塔顶循环回流（简称顶循）系统腐蚀加剧的现状，对自合成的新型油酸基咪唑啉酰胺（EYP）的缓蚀性能进行了研究。采用失重法评价缓蚀剂EYP在模拟顶循油体系中的缓蚀性能，考察了EYP的添加量和腐蚀体系温度对其缓蚀效率的影响，并采用电化学方法对缓蚀机理进行了探讨，采用SEM对碳钢表面的腐蚀形貌进行了分析。结果表明：EYP在顶循油模拟体系中对A3碳钢具有优良的缓蚀性能；随着腐蚀体系中EYP添加量的增大，缓蚀效率先增大然后略有降低；温度对EYP的缓蚀效率影响较小，随着温度升高，EYP的缓蚀效率略有降低； EYP在金属表面的吸附包括化学吸附和物理吸附，呈一种有序化的状态；EYP是一种能同时抑制阴极和阳极反应的高效“混合型缓蚀剂”。

INHIBITION PROPERTY OF OLEIC IMIDAZOLINE AMIDE FOR A3 MILD STEEL CORROSION

In this paper, the corrosion inhibition performance of a newly synthesized oleic acid imidazoline amide (EYP) which was intended to be used in the overhead circulating reflux system of fractionating tower was investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The surface morphologies of mild steel specimens were observed by scanning electron microscope (SEM) and the kinetic parameters were calculated from experimental weight loss results. Weight loss and SEM results demonstrated that EYP can effectively protect A3 mild steel from corrosion in simulative top cycle oil. The inhibition efficiency of EYP increased firstly and then decreased mildly with the increase of EYP concentration and the inhibition efficiency decreased mildly as the experimental temperature increased. Electrochemistry results showed that EYP was a mixed-type inhibitor retarding mild steel corrosion without changing the mechanism of anodic or cathodic reaction. The calculated kinetic parameters revealed that EYP was absorbed onto mild steel by both chemisorption and physisorption.