醋酸溶液中十二烷基磺酸钠对冷轧钢的缓蚀作用

Corrosion inhibition of sodium dodecyl sulfonate on cold rolled steel in acetic acid solution

利用失重法和动电位极化曲线法及电化学阻抗谱法研究了阴离子表面活性剂十二烷基磺酸钠(SDS)对冷轧钢在0.1 mol/L HAc溶液中的缓蚀作用.结果表明:SDS在0.1 mol/L醋酸溶液中能对冷轧钢起到较好的缓蚀作用,缓蚀率随着缓蚀剂浓度的增加而增大,但随温度的增加而下降,最大缓蚀率可达94%.塔菲尔极化曲线表明SDS为抑制阴极为主型缓蚀剂.缓蚀剂在钢表面的吸附是自发、放热过程且符合Langmuir吸附方程.SDS在钢表面发生物理吸附的同时伴随化学吸附的发生,吸附为熵增过程.

Sodium dodecyl sulfonate （SDS）as corrosion inhibitor for cold roiled steel in 0. 1 mol/L acetic acid solu- tion was investigated by the method of weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy（EIS）. The results show that SDS is a very good inhibitor for CRS in 0. 1 mol/L HAc. The inhibition efficiency increases with increasing concentration of inhibitorand the best inhibition efficiency is 94%. However, in- hibition efficiency decreases with increase of the temperature. Polarization data show that SDS behaves as a cathode for major inhibitor in HAc solution. The adsorption of inhibitors on the CRS surface is a spontaneous and exothermic process and basically obeys the Langmuir adsorption isotherm equation. cal absorption going with chemical absorption. It is a process of entropy increase by Physi-