辛烷基二甲基苄基季铵盐离子液体对Q235钢的缓蚀性能

利用失重分析、 极化曲线、 电化学阻抗谱和扫描电子显微镜等研究了辛烷基二甲基苄基季铵盐离子液体(ODBA)对1 mol/L盐酸溶液中Q235钢的缓蚀性能, 并分析了其在Q235钢表面的吸附行为. 失重分析结果表明, 随着ODBA浓度的增加, 缓蚀效率逐渐提高, 在ODBA质量浓度为0.2 g/L、 温度为30 ℃时, 缓蚀效率可达95.53%; 电化学测试结果与失重分析结果一致; 热力学研究结果表明, ODBA在碳钢表面的吸附是放热过程, 且遵循Langmuir吸附等温线, 是以化学吸附为主的混合型吸附; 同步热分析测试表明ODBA具有良好的热稳定性.

Corrosion Inhibition of Q235 Steel by Octyl Dimethyl Benzyl Quaternary Ammonium Salt Ionic Liquid†

The self-made octyl dimethyl benzyl quaternary ammonium ionic liquid(ODBA) was synthesized and its corrosion inhibitory property for Q235 steel in 1 mol/L HCl solution was studied by means of mass loss measurement, polarization curve, electrochemical impedance spectroscopy(EIS), and scanning electron microscopy(SEM) and its adsorption behavior on carbon steel surface was analyzed. The mass loss results show that the inhibition efficiencies increased with the increase of ODBA concentration. When the mass concentration was 0.2 g/L and the temperature was 30 ℃, the inhibition efficiency could reach 95.53%. ODBA is a mixed type inhibitor and preferentially inhibit the anodic reaction. The results of electrochemical test were consistent with that of mass loss test. Thermodynamic and activation energy parameters were discussed. Adsorption of ODBA was found to follow the Langmuir’s adsorption isotherm. It belongs to the mixed adsorption based on chemical adsorption. Adsorption of ODBA on steel surfaces is spontaneous and exothermic, accompanied by an increase in entropy. Thermogravimetric analysis(TGA) shows that ODBA has good thermostability.