以正辛胺、苯乙酮、甲醛为主要原料，通过两步Mannich反应得到双曼尼希碱DMN，并对反应条件进行了优化。采用静态失重、极化曲线、吸附行为计算、扫描电镜（SEM）和电子能谱（EDS）等方法研究了DMN的缓蚀性能以及缓蚀机理。结果表明，在20%盐酸溶液中加入质量分数为0.25%的DMN，在温度为90℃及时间为4 h时，对N80试片的缓蚀率达到99.70%，与单曼尼希碱MN相比具有更好的缓蚀效果；DMN是同时抑制阳极和阴极反应的混合型和吸附成膜型缓蚀剂；DMN的吸附行为服从Langmuir吸附等温式，吸附过程主要是化学吸附，KI与DMN复配进一步增强了缓蚀剂的效果。

DMN,a double Mannich base,is synthesized with N-octylamine,acetophenone and formaldehyde as main raw materials,and the reaction conditions are optimized.The corrosion inhibition performance and mechanism of DMN are examined by static weight loss,polarization curve,adsorption behavior,SEM and EDS measurements.The results show that the corrosion inhibition rate of DMN for N80 steel piece can reach 99.70% under the following conditions:0.25% of DMN,corrosion temperature at 90℃ and 4 hours of corrosion time.Compared with Mannich base MN,DMN shows better corrosion inhibition effect.DMN is a kind of mixed and adsorption film-forming inhibitor that can simultaneously inhibit anode and cathode reactions.DMN's adsorption behavior obeys Langmuir adsorption isotherm,and its adsorption type is mainly chemical adsorption.Compounding KI with DMN can further enhance the corrosion inhibitor effect.

郭恒瑞(1995-),男,硕士研究生,研究方向为腐蚀与防护,hengrui.guo@outlook.com