材料期刊网

曼尼希碱是一类重要的金属缓蚀剂。以肉桂醛、环己酮、水合肼为原料合成曼尼希碱缓蚀剂CJ，采用正交试验优化得出最佳合成条件，同时采用极化曲线和电化学阻抗谱等电化学方法研究了曼尼希碱缓蚀剂CJ的缓蚀机理。结果表明：当肉桂醛/水合肼摩尔比为3∶1、环己酮/水合肼摩尔比为1∶1、反应温度为45℃、pH为4、反应时间为8 h时，CJ具有最好的缓蚀性能。在15％盐酸中，当缓蚀剂加量为1．0％时，N80钢片的腐蚀速率为0．2991 g/（m2·h），远低于SY/T 5405-1996中的一级标准。曼尼希碱缓蚀剂CJ在钢铁表面的吸附符合Langmuir吸附等温方程；曼尼希碱缓蚀剂CJ是以抑制阳极腐蚀过程为主的混合型缓蚀剂。

Mannich base is a kind of important corrosion inhibitors.CJ Mannich base inhibitor was synthesized with cinnamyl aldehyde,cyclohexanone and hydrazine hydrate as raw materials.The optimum synthesis conditions were obtained by orthogonal test.The corrosion inhibition mechanism of CJ Mannich base as acidizing corrosion inhibitor was analyzed by polarization curves and EIS.The results showed that the optimum synthesis conditions were as follows:molar ratio of cinnamyl aldehyde to hydrazine hydrate was 3∶1 ,molar ratio of cyclohexanone to hydrazine hydrate was 1∶1,the temperature was 45 ℃,pH value was 4,the synthetic time was 8 hours.The results of static weight-loss showed that the corrosion rate of N80 steel plate in 15%HCl solution was 0.299 1 g/(m2 ·h),when the dosage of inhibitor added was 1.0%,which was lower than the first grade standard of SY/T 5405-1996,and the inhibitor had good heat-resistance and aicd-tolerance.The adsorption behavior of CJ Mannich base corrosion inhibitor on the surface of steel conforms to Langmuir adsorption isotherm.Electrochemical test showed the inhibitor of CJ Mannich base belonged to a mainly anodic-controlling composite corrosion inhibitor.