盐酸介质中吐温-60对冷轧钢的缓蚀作用机理  

Corrosion inhibition mechanism of tween-60 for cold rolled steel in hydrochloric acid solution

作　　者：木冠南[1] 李向红[1] 屈庆[1] 周俊[1] 

机构地区：[1]云南大学化学系,云南昆明650091

出　　处：《化工学报》2005年第11期2150-2156,共7页CIESC Journal

基　　金：国家自然科学基金项目(50261004).

摘　　要：用失重法及电化学法研究了非离子表面活性剂吐温-60对冷轧钢在1.0～8.0 mol·L-1 盐酸溶液中的缓蚀作用. 结果表明:吐温-60对冷轧钢在1.0 mol·L-1盐酸溶液中具有良好的缓蚀作用,且其在钢表面的吸附符合Langmuir吸附模型. 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. 动电位极化曲线表明,吐温-60为混合抑制型缓蚀剂,但主要是抑制阴极反应. 通过吸附理论和动力学公式求出了相应的吸附热力学参数和动力学参数,并根据这些参数详细讨论了缓蚀作用机理.The inhibition effect of tween-60 on the corrosion of cold rolled steel （CRS） in 1.0-8.0 mol · L^-1 hydrochloric acid was studied with the mass loss method and potentiodynamic polarization method. The results showed that tween-60 was a good inhibitor in 1.0 mol· L^-1 HCl. Inhibition efficiency increased with increasing inhibitor concentration and the maximum inhibition efficiency was 91.2% at 30 ℃ even when inhibitor concentration is low. However, inhibition efficiency decreased with increasing hydrochloric acid concentration and temperature. Polarization curves showed that tween-60 was a mixedtype inhibitor in hydrochloric acid, and apparently inhibited iron＇s cathodic reaction. The experimental data were treated with adsorption theory and kinetic equations. Both the thermodynamic and kinetic parameters could be obtained. The thermodynamic results showed that the adsorption of tween-60 on the cold rolled steel surface obeyed the Langmuir adsorption isotherm equation. Furthermore, the adsorption process was a spontaneous and exothermic process accompanied by a decrease in entropy. The kinetic results showed that the rate constant （k） decreased obviously after adding tween-60 in HCl solutions, while the kinetic reaction constant （B） increased. The values of both apparent activation energy （Ea） and pre-exponential factor （A） increased in inhibited hydrochloric acid solution. The inhibitive mechanism was mostly decided by the apparent activation energy.

关 键 词：钢 盐酸 吐温-60 吸附 缓蚀机理 

分 类 号：TG174.42[金属学及工艺—金属表面处理]