采用失重法测定腐蚀速率,研究苯乙腈类化合物在不同温度下对20~#碳钢在5%盐酸中的缓蚀作用机机理,探讨在苯乙腈分子中对位引入不同官能团及在α-位引入异丙基对缓蚀性能的影响。根据缓蚀率和温度的关系及对碳钢在盐酸中的溶解动力学分析推测,苯乙腈类化合物的缓蚀机理是化学吸附作用。在对位引入具有推电子作用官能团可提高其缓蚀能力,引入吸电子的官能团则减弱缓蚀作用。α-位异丙基的作用,则视对位基团的情况而异。
The mechanism of corrosion-inhibiting action of benzeneacetonitriles was investigated by measuring the corrsion rates with gravimetrie method.The effect of introducing different funetional groups into the para-position of the benzene ring and an isopropyl in the α-position on the inhibiting efficiency is discussed. The analysis of the kinetics of dissolution of steel in HCl solution and the characteristic relationship between the inhibiting efficiency and temperature suggests that chemisorption is the mechanism of the inhibiting action of benzeneacetonitriles.Introducing electron-donating groups into the para-position increases the inhibiting efficiency while introducing electron-withdrawing groups into the para-position decreases the inhibiting efficiency.An isopropyl group in the α-position will either raise or reduce the inhibiting efficiency.
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