曼尼希碱缓蚀剂XJ合成及其对N80钢的缓蚀性能

Synthesis of XJ Mannich Base Inhibitor and Research of N80 Steel Corrosion Performance

采用甲醛、苯乙酮、芳香肼为原料合成XJ系列曼尼希碱,通过正交实验得出最优合成条件为:反应温度70℃,甲醛/芳香肼摩尔比2.9:1、苯乙酮/芳香肼摩尔比3.2:1、pH值4、反应时间6h。通过静态失重法和电化学方法评价了曼尼希碱缓蚀剂对N80钢的缓蚀性能。静态失重法表明,N80钢试片在加有1%XJ-3的15%盐酸中的腐蚀速率为0.256g/m^2·h,远低于SY/T 5405-1996《酸化用缓蚀剂性能试验方法及评价指标》中的一级标准。电化学测试结果表明,该缓蚀剂是以抑制阳极腐蚀过程为主的混合型缓蚀剂,交流阻抗测试进一步证实了XJ系列缓蚀剂的缓蚀效果。该缓蚀剂在N80钢表面上的吸附行为服从Langmiur吸附等温式。

XJ Mannich bases were synthesized with formaldehyde, acetophenone, aromatic hydrazine as raw material. Through orthogonal experiments, the optimum synthesis conditions was obtained as follows： the reaction temperature was 70~C, the molar ratio of formaldehyde to aromatic hydrazine was 2.9： 1, the malor ratio Of acetophenone to aromatic hydrazine was 3.2：1, the pH value was 4 and the reaction time was 6 hours. The Mannich base prepared by the optimal recipes was named as XJ-3. The inhibition action of XJ-3 Mannich base on N80 steel was investigated by means of mass loss and electrochemical techniques. It was showed that the corrosion rate of N80 steel was 0.256 g. （ rd ~ h）l in 15% hydrochloric acid containing 1.0% of XJ-3,which was lower than the first Grade Standard of SY/T 5405-1996. Electrochemical test results showed that, the XJ-3 Mannich base belonged to a mainly anodic-controlling composite corrosion inhibitor. XJ series corrosion inhibit0r effect was further confirmed by AC impedance technique. The adsorption behavior of the XJ corrosion inhibitor on the surface of N80 steel was subject to Langmiur adsorption isotherm.