Inhibitive effect of some 1,5-benzodiazepin 2-one derivatives on the corrosion of iron in 1M HCl
作者:M El Achouri、S Kertit、M Salem、MS Hajji、EM Essassi
DOI:10.1051/jcp/1996932011
日期:——
The effect of some 1,5-benzodiazepin 2-one derivatives on the corrosion behaviour of iron in 1M HCl has been investigated by gravimetric and electrochemical polarization methods. Both techniques gave the same order of inhibition efficiencies. Polarization data indicate that all of the compounds tested act as mixed-type inhibitors, without changing the mechanism of the cathodic hydrogen evolution reaction. The inhibition efficiency of the compounds tested has been found to decrease as follows: 7-methyl 4-phenyl 1,5-benzodiazepin 2-one > 4-phenyl 1,5-benzodiazepin 2-one > 3,7-dimethyl 1,5-benzodiazepin 2-one. These compounds are adsorbed on the iron surface according to a Frumkin isotherm. The inhibition efficiency and the mode of adsorption of these compounds have been explained on the basis of nature of substituents and stability of conformers in the seven-membered ring of 1,5- benzodiazepin 2-one. The effect of temperature in the range 18-50 °C indicates that the protection efficiency decreases very slightly when the temperature increases. Apparent activation energies were determined.
通过重量分析和电化学极化方法研究了一些1,5-苯二氮卓2-酮衍生物对铁在1M HCl中的腐蚀行为的影响。两种技术都给出了相同顺序的抑制效率。极化数据表明,所有测试的化合物都充当混合型抑制剂,而不改变阴极析氢反应的机制。发现测试化合物的抑制效率按如下方式降低: 7-甲基 4-苯基 1,5-苯二氮卓 2-一 > 4-苯基 1,5-苯二氮卓 2-一 > 3,7-二甲基 1,5 -苯二氮卓2-一。这些化合物根据弗鲁姆金等温线吸附在铁表面上。这些化合物的抑制效率和吸附模式已根据1,5-苯二氮卓2-酮七元环中取代基的性质和构象异构体的稳定性进行了解释。 18-50℃范围内温度的影响表明,当温度升高时,保护效率下降非常轻微。测定表观活化能。