合成了一种改性聚酰胺类缓蚀剂,采用动态失重法和动电位极化曲线评价了其在CO2腐蚀体系中对N80钢的缓蚀性能,并和咪唑啉季铵盐的缓蚀性能进行了比较.通过量子化学半经验算法AM1方法,计算了改性聚酰胺和咪唑啉季铵盐的最高占有轨道能级(EHOMO)和最低未占有轨道能级(ELUMO),探讨了改性聚酰胺的缓蚀机理.结果表明:所合成的改性聚酰胺对二氧化碳腐蚀具有很好的抑制作用,但效果逊于咪唑啉季铵盐.它是一种以抑制阳极过程为主的混合型缓蚀剂,可能是通过多个吸附中心与金属形成牢固的配位键,起到保护金属的作用.

A novel modified polyamide corrosion inhibitor was synthesized.Its corrosion inhibition property was evaluated by weight-loss method and polarization curve measurement under simulated operation conditions with CO2,and then compared with imidazoline quaternary ammonium salt.Quantum chemistry AM1 method was used to calculate the orbit energy of the hightest occupied molecular (EHOMO) and orbit energy of the lowest unoccupied molecular orbit ELUMO) of modified polyamide and imidazoline quaternary ammonium salt,and the inhibition mechanism of modified polyamide was investigated.The results showed that the modified polyamide could inhibit CO2 corrosion effectively,but it was inferior to imidazoline quaternary ammonium salt.It belongs to mixed type inhibitor which controls anodic processes principally and has coordinate bond with metal through lone pair electrons provided by many adsorption centers to protect the metal.