盐酸液中溴化十六烷基吡啶对锌的缓蚀作用及吸附热力学性能

Inhibition and Adsorption Thermodynamics of Cetylpyridini um Bromide for Zinc in HC1 Solution

为了研究阳离子表面活性剂在盐酸溶液中对锌的吸附及缓蚀作用,用失重法研究了盐酸溶液中溴化十六烷基吡啶对锌的缓蚀作用,并应用吸附理论和Sekine方法对静态挂片试验数据进行处理。结果表明,溴化十六烷基吡啶对锌在盐酸介质中的腐蚀具有良好的抑制作用,是一种吸附型缓蚀剂,低浓度下在锌表面的吸附基本符合Langmuir等温式,相关系数大于0.998。缓蚀率随缓蚀剂浓度增加或温度升高而增大。通过对试验数据的处理,获得了吸附过程ΔH0、ΔS0和ΔG0等重要热力学参数,ΔH0=14.00kJ/mol,ΔS0随温度升高而增加,ΔG0随温度升高而下降。本研究为后续工作提供了参考。

Inhibition of cetylpyridinium bromide (CPB) for zinc in hydrochloric acid was investigated using weight loss method. Experiments show that the adsorption of CPB on zinc is the key to inhibition, and the Lang muir isotherm is followed. Some important thermodynamic param eters in adsorption process were calculated from testing data bySekine method.