盐酸介质中1-丙基-2-甲基-3-烷基苯并咪唑盐对Q235钢的缓蚀作用

INHIBITION OF 1-PROPYL-2-METHYL-3-ALKYL BENZIMIDAZOLE ON Q235 STEEL IN HCl SOLUTION

合成了不同烷基链长的1-丙基-2-甲基-3-烷基苯并咪唑盐,通过动电位极化曲线、电化学阻抗谱和扫描电镜等方法研究其对Q235钢在1 mol/L HCl中的缓蚀作用。结果表明,1-丙基-2-甲基-3-烷基苯并咪唑盐对Q235钢在盐酸溶液中具有优异的缓蚀性能,其中1-丙基-2-甲基-3-十四烷基苯并咪唑盐的缓蚀性能最好,当浓度达到10 mg/L时缓蚀率达98.6%,是以阴极型为主的混合型缓蚀剂。

New corrosion inhibitors l-propyl-2-methyl-3-alkyl benzimidazole salts were synthesized and their inhibition for Q235 steel in 1 mol/L HC1 solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy（EIS）.Meanwhile,the surface morphology was studied by scanning electron microscopy（SEM）.The results showed that benzimidazole salts had excellent inhibiting efficiency at very low concentration and the inhibiting efficiency increased with the increase of alkyl chain.l-propyl-2-methyl-3- tetradecyl benzimidazole salts had the highest efficiency among four inhibitors,in which the inhibition efficiency reached up to 98.6%at the concentration of 10 mg/L.These inhibitors acted as mixed inhibitors with cathodic inhibition as dominative action.