咪唑啉缓蚀剂合成过程中成环程度与其性能的关系

以油酸、二乙烯三胺为原料在160 ℃经不同反应时间合成了系列咪唑啉,应用红外光谱、紫外分光光度法对合成产物进行了鉴定和分析,测定了不同反应时间的产水率和产物的酸值,并通过极化曲线考察了产物的缓蚀性能.结果表明:咪唑啉合成过程中,烷基酰胺的生成和烷基酰胺的环化是同时进行的;反应时间越长,烷基酰胺环化程度越高,产物的缓蚀性能越好;通过比较添加缓蚀剂前后A3钢的极化曲线可以看出,添加缓蚀剂后自腐蚀电位正移,说明咪唑啉主要抑制阳极过程而起到缓蚀作用,属于阳极型缓蚀剂.

Relationship between cyclization degree of imidazoline corrosion inhibitor and its corrosion inhibition performance

A series of imidazolines are prepared using oleic acid and diethylenetriamine as raw materials at 160℃ in different reaction times. The products are analyzed with IR and UV. The producing water volumes and the acid values of the products in different reaction times are measured. The corrosion inhibition performances of the products are investigated by electrochemical polarization curves. The experimental results show that the formation and the cyclization of alkylamide occur at the same time; the longer the reaction time, the higher the cyclization degree of alkylamide and the better the corrosion inhibition performance of the products; the polarization curves show that the corrosion potential of A3 carbon steel becomes more positive after the inhibitor is added than that before.