研究了有各类工业用表面活性剂存在条件下金属锡与硝酸的反应,采用Shams El-din建立的测温法评估不同表面活性剂的缓蚀效率.温度-时间曲线、反应数和计算的缓蚀百分率表明,表面活性剂使反应速率降低,依次为两性活性剂>阳离子活性剂>非电离活性剂.相反,对阴离子活性剂观察到相反的效应.在所有情况下,反应速率随着硝酸浓度的提高而增大.
The reaction of metallic tin with nitric acid was investigated in the presence of different types of technical surface active agents employing the thermometric method as developed by Shams El-din for evaluating the inhibition efficiency of different surfactants.The temperature-time curves,the reaction number and the calculated percentage inhibition reveal the fact that amphoteric,cationic and nonionic surfactants reduce the rate of reaction in the order amphoteric ＞cationic ＞ nonionic.On the contrary,for the anionic surfactant an opposite effect was observed.In all cases the rate of reaction is enhanced by increasing concentration of nitric acid.
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