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首页> 外文期刊>International Journal of Electrochemical Science >Comparative Study of Pyridine and Pyrimidine Derivatives as Corrosion Inhibitors of C38 Steel in Molar HCl
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Comparative Study of Pyridine and Pyrimidine Derivatives as Corrosion Inhibitors of C38 Steel in Molar HCl

机译：吡啶和嘧啶衍生物作为C38钢在盐酸中的缓蚀剂的比较研究

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摘要

Corrosion inhibition of C38 steel in 1 M HCl was investigated in the absence and presence of differentconcentrations of two imidazo derivatives namely, 2-phenylimidazo[1,2-a]pyridine (P1) and 2-(m- methoxyphenyl) imidazo[1,2-a]pyrimidine (P5). Weight loss, potentiodynamic polarization andelectrochemical impedance spectroscopy techniques were employed. Impedance measurementsshowed that the double-layer capacitance decreased and charge-transfer resistance increased withincrease in the inhibitors concentration and hence increasing in inhibition efficiency. Potentiodynamicpolarization study showed that all the inhibitors act as mixed-type inhibitors. The inhibitors wereadsorbed on the steel surface according to the Langmuir adsorption isotherm model. From theadsorption isotherm, some thermodynamic data for the adsorption process were calculated anddiscussed. Kinetic parameters activation such as activation energy, pre-exponential factor, enthalpy ofactivation and entropy of activation were evaluated from the effect of temperature on corrosion andinhibition processes. E (%) values obtained from various methods used are in good agreement.
机译：研究了在不存在和存在不同浓度的两种咪唑衍生物即2-苯基咪唑并[1,2-a]吡啶（P1）和2-（间甲氧基苯基）咪唑[1]的情况下，研究了C38钢在1 M HCl中的腐蚀抑制作用， 2-a]嘧啶（P5）。使用了重量损失，电位动力学极化和电化学阻抗谱技术。阻抗测量表明，在抑制物浓度范围内，双层电容降低，电荷转移电阻增加，从而抑制效率提高。电位动力极化研究表明，所有抑制剂均起混合型抑制剂的作用。根据Langmuir吸附等温线模型，抑制剂被吸附在钢表面。根据吸附等温线，计算并讨论了吸附过程的一些热力学数据。根据温度对腐蚀和缓蚀过程的影响，评估了动力学参数的活化，如活化能，指数前因子，活化焓和活化熵。通过各种方法获得的E（％）值吻合良好。

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