缓蚀剂SDS+CTAB复配溶液中碳钢电化学腐蚀性能的影响因素研究

Investigation of Electrochemical Corrosion Behavior of Carbon Steel in Presence of SDS+CTAB

通过中心复合设计(CCD)法设计实验并结合动电位极化曲线和电化学阻抗谱(EIS)的测量,研究了Cl^-浓度、温度、pH值、SDS浓度和CTAB浓度5种因素对碳钢腐蚀性能的影响,确定其显著性影响因素,从而探索有机缓蚀剂SDS和CTAB复配溶液配比及使用环境最佳区间。结果表明:SDS和CTAB及两者的复配溶液均对碳钢具有良好的缓蚀效果,两者混合使用的复配溶液具有很好的协同作用。Cl-浓度为0.01mol/L、pH值为12、温度为10℃、SDS浓度为150ppm、CTAB浓度为20ppm时缓蚀效果最佳。

Central composite design（CCD）strategy,potentiodynamic polarization and electrochemical impedance spectroscopy（EIS）were used to investigate the effects of Cl^-concentration,temperature,pH value and SDS/CTAB concentrations on the electrochemical corrosion behavior of carbon steel.The significant influencing factors and the best ratio of SDS and CTAB compound solution were also determined.The results reveal that corrosion of carbon steel is inhibited in presence of SDS,CTAB and their mixture.The optimum condition of the corrosion inhibition of the mixture of these two anionic and cationic surfactants on carbon steel is Cl^-concentration of 0.01mol/L,pH value of 12,temperature of 10℃,SDS concentration of 150 ppm and CTAB concentration of 20 ppm.