采用正交试验法和静态挂片失重法, 研究了以油酸和三乙烯四胺为反应物、二甲苯为携水剂, 且适合某模拟采出水的咪唑啉缓蚀剂的性能及其合成条件。通过红外光谱、静态腐蚀失重、电化学测试和扫描电镜等方法, 研究了咪唑啉分子结构和缓蚀性能。结果表明, 咪唑啉最佳合成反应条件为酸胺比为1.0∶3.1, 合成温度为190 ℃, 反应时间为7 h, 此时缓蚀效率达到90%; 该类型缓蚀剂在低于60 ℃介质环境中, 最佳使用浓度为300 mg/L, 此时缓蚀率为93%, 使用周期约为30 h; 极化曲线表明, 该缓蚀剂为混合型缓蚀剂; 扫描电镜表明, 缓蚀剂抑制了腐蚀反应和腐蚀产物的生长。

An imidazoline inhibitor was synthesized from oleic acid and diethylenetriamine as reactants, and triethylenetetramine as water carrying agent. The influences of inhibitor concentration, synthesis temperature and reaction time on corrosion inhibition performance were studied by orthogonal experiment and weight loss method. The molecular structure and corrosion inhibiting performance were studied by infrared spectrum, weight loss testing, electrochemiscal measurement and SEM. Results indicate that the optimized parameters for the synthesis are as follows: the ratio of oleic acid to triethylenetetramine is 1.0:3.1, synthesis temperature is 190℃, reacting time is 7h. Under the optimal synthetic reaction conditions, the corrosion inhibition efficiency of the prepared inhibitor is over 90%. The optimized temperature and concentration for using this inhibitor are below 60℃ and 300mg/L, respectively, at this concentration the corrosion inhibition efficiency is over 93%. The electrochemiscal polarization curves show that the inhibitor can be classified as a mixed type corrosion inhibitor. SEM indicated that the inhibitor prevented corrosion reaction and blocked the growth of the corrosion product.