曼尼希酸化缓蚀剂H-402的合成及其缓蚀性能研究

Study on the Synthesis and Performance of a Mannich Based Acidification Corrosion Inhibitor

张 勇 陆 原 张 颖 胡 廷 赵 璐

ZHANG Yong LU Yuan ZHANG Ying HU Ting ZHAO Lu

本文采用仲胺、苯乙酮、甲醛为原料，通过曼尼希缩合反应，合成了一种油田酸化缓蚀剂 H-402，研究了合成工艺对产物性能的影响及缓蚀机理。结果表明：在仲胺/苯乙酮/甲醛的摩尔比1:2:5、反应温度80℃、反应时间10 h条件下，所合成的酸化缓蚀剂 H-402的缓蚀效果最佳。该缓蚀剂与聚醚、丙炔醇等具有增效作用，加剂量为0.5%时达到缓蚀剂一级水平。该缓蚀剂为抑制阳极过程为主的混合型缓蚀剂。扫描电镜结果显示，加入0.5%酸化缓蚀剂H-402后Q235挂片表面的腐蚀形态得到极大的改善。

A oilfield acidification corrosion inhibitor was synthesized by Mannich reaction of secondary amine, acetophenone and formaldehyde. The effect of the synthetic technology，including molar ratio of reactant, reaction temperature and reaction time, on the inhibition performance of the inhibitor was evaluated by coupon corrosion tests. In addition, the inhibition mechanism of the inhibitor was investigated by electrochemical test and scanning electronic microscope observation. The results showed that the inhibitor exhibited the best inhibition efficiency when the molar ratio of primary amine, acetophenone and formaldehyde was 1:2:5 and the reaction were maintained at 80℃ for 10 h. After compounded with polyether and propargyl alcohol, the inhibitor could reach the first-class level at the dosage of 0.5%. The corrosion inhibitor was assigned as a mixed inhibitor mainly which inhibited the anode process through electrochemistry method. The scanning electronic microscope observation indicated that the corrosion forms of steels were improved significantly after adding 0.5% corrosion inhibitor.