Abstract: Mannich inhibitor was synthesized using cinnamaldehyde, acetophenone and aniline as raw materials, Cyclodextrins as phase transfer catalyst, through condensation of aldehydes and ketones amine generate in the aqueousphase. Under corrosive conditions of refinerycrude oil distillationunit, the optimum polarization extrin amount 0.3% was determined by taking weight loss method and curve scyclod. Effect of the corrosion inhibition of the mannich alkali was investigated using the weight loss method, potentiodynamic polarization and electrochemical impedance spectroscopy .The results showed that the Mannich base was a mixed corrosion inhibitor mainly by restraining the anodic process, and the inhibition rate increased with increasing of Mannich base concentration. When the amount of inhibitor concentration was 0.2%, the inhibition rate reached 94.37%,and Mannich base can effectively inhibit corrosion of 20# steel in the HClH₂SH₂O system.

Key words: Corrosion inhibitor,    ,  Mannich base,    ,  Phase transfer catalyst,    ,  Performance evaluation

摘要： 以肉桂醛、 苯乙酮和苯胺为原料, 环糊精为相转移催化剂, 在水相中经过醛酮胺缩合得到曼尼希碱缓 蚀剂。在模拟炼油厂常减压装置的腐蚀介质条件下, 通过挂片失重法和极化曲线法确定了环糊精最佳质量分数为 0. 3%, 采用挂片失重法、 动电位极化曲线法和交流阻抗法考察了该曼尼希碱的缓蚀性能。结果表明, 曼尼希碱是以 抑制阳极过程为主的混合型缓蚀剂, 缓蚀率随曼尼希碱的质量分数增加而增大, 当缓蚀剂的体积分数为0. 2%时, 缓 蚀率达到9 4. 3 7%, 能够有效抑制 HC l - H2S - H2O体系中2 0#碳钢的腐蚀。

关键词: 缓蚀剂, 曼尼希碱, 相转移催化剂, 性能评价