溴化十六烷基吡啶在HCl中对冷轧钢的缓蚀作用

Inhibition Effect of Hexadecylpyridinium Bromide on Cold Rolled Steel in HCl Solution

用失重法研究了在1．0mol／L HCl中20—50％时溴化十六烷基吡啶（HDPB）在冷轧钢表面上的吸附及缓蚀作用。结果表明，HDPB对钢具有良好的缓蚀作用，缓蚀率随缓蚀剂浓度和温度的增加而增大；HDPB在钢表面的吸附符合Langmuir吸附模型。求出了相应的吸附热力学参数（吸附自由能△G^0，吸附焓△H^0，吸附熵△S^0），并根据这些参数详细讨论了缓蚀作用机理。

The adsorption and inhibition effect of hexadecylpyridinium bromide （HDPB） on cold rolled steel （CRS） in 1.0 mol/L HC1 solution at 20 - 50℃ has been investigated by weight loss method. The results show that HDPB is a very good inhibitor for CRS in HC1 solution, and the maximum inhibition efficiency is up to 98.4%. The adsorption of HDPB on CRS surface obeys Langmuir adsorption isotherm equation. Three adsorption thermodynamic parameters （ adsorption free energy △G^0, adsorption heat △H^0, adsorption entropy △S^0 ） are also calculated. The inhibitive mechanism is discussed in detail according to the parameters.