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目的：研究十八胺、不饱和十八胺,N-十八烷基丙撑二胺等3种有机胺在1 mol/L的盐酸溶液中的缓蚀性能,探讨3种有机胺在金属表面的成膜性及其缓蚀机理。方法采用静态挂片质量损失法、动电位极化曲线测试、接触角测试及AFM力曲线测试研究3种有机胺在碳钢表面的成膜性及膜的均匀性。结果不饱和十八胺的缓蚀率明显高于另外两种,为阴极抑制型缓蚀剂。接触角测试表明,不饱和十八胺的疏水性达到了优等级,高于另外两种有机胺；其缓蚀机理为在金属表面形成一层致密的疏水性保护膜,有效隔离了金属与腐蚀介质的接触。在粘附力测试实验中,不饱和十八胺在金属表面测量数据分布较为平均,其标准偏差最小,说明这种胺在金属表面成膜最好。另外,不饱和十八胺在金属表面的平均粘附力最大。结论不饱和十八胺具有最好的缓蚀性能。

ABSTRACT:Objective To investigate the inhibition performances of three amines including octadecylamine, unsaturated octade-cylamine and N-octadecyl trimethylene diamine in the 1 mol/L HCl solution and further explore the film-forming property and inhi-bition mechanism of the three organic amines. Methods Static weight-loss method, potentiodynamic polarization, contact angle and AFM force curve measurement were used to investigate the film-forming ability and the film uniformity of these three organic amines on the metal surface. Results The inhibition efficiency of unsaturated octadecylamine, belonging to the cathode type inhibitor, was significantly higher than the other two organic amines. The contact angle measurement showed that the hydrophobicity of the unsatu-rated octadecylamine film reached the excellent grade, higher than the other two organic amines. Its inhibition mechanism was to form a dense and hydrophobic film on the metal surface so as to prevent the metal from contacting with the corrosive medium. In the adhesion strength test, the measured data distribution of the unsaturated octadecylamine on the metal surface was more uniform, and its standard deviation was the smallest, indicating that its film homogeneity was the best. Additionally, the mean adhesion force of the unsaturated octadecylamine on the metal surface was the highest. Conclusion The unsaturated octadecylamine has the best corrosion performance among the three amines.