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采用失重法、动电位极化曲线、电化学阻抗谱(EIS)和扫描电子显微镜(SEM)研究了氯化硝基四氮唑蓝(NTBC)在1.0-5.0mo·lL-1HCl溶液中对冷轧钢(CRS)的缓蚀作用.结果表明:NTBC在1.0mo·lL-1HCl溶液中对冷轧钢具有良好的缓蚀作用,且在钢表面的吸附符合Langmuir吸附等温式.缓蚀率随缓蚀剂浓度的增加而增大,但随盐酸浓度和温度的增加而减小.求出了相应的吸附热力学(吸附自由能ΔG0,吸附焓ΔH0,吸附熵ΔS0)和腐蚀动力学参数(腐蚀速率常数k,动力学常数B),并根据这些参数讨论了缓蚀作用机理.动电位极化曲线表明:NTBC为混合抑制型缓蚀剂;EIS谱在高频区呈容抗弧,在低频区出现感抗弧,电荷转移电阻随缓蚀剂浓度的增加而增大.SEM再次表明NTBC对钢在盐酸介质中的腐蚀产生了明显的抑制作用.
Using weight loss method, potentiodynamic polarization curve, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM), the effects of nitroblue tetrazolium chloride (NTBC) in 1.0-5.0mo · lL-1HCl solution on the cold (CRS) .The results show that NTBC has a good corrosion inhibition on cold-rolled steel in 1.0mol · L-1 HCl solution, and the adsorption on the steel surface accords with the Langmuir adsorption isotherm.The corrosion inhibition rate The results show that the adsorption kinetics (adsorption free energy ΔG0, adsorption enthalpy ΔH0, adsorption entropy ΔS0) and corrosion kinetics parameters (corrosion The rate constants k, and the kinetic constants B). The mechanism of corrosion inhibition was discussed based on these parameters. The potentiodynamic polarization curves of NTBC indicated that NTBC was mixed inhibitor; The inductive arc appeared in the region, and the charge transfer resistance increased with the concentration of corrosion inhibitor.SEM again showed that NTBC significantly inhibited the corrosion of steel in hydrochloric acid medium.