Abstract—

A green compound, N,N′-bis(2,4,6-trihydroxybenzaldehyde)-2,2-dimethylpropandiimine, was studied as an acid corrosion inhibitor for X80 steel. Aqueous 15% HCl was utilized for simulating the oil well acidizing fluid at various temperatures. The inhibition performance was assessed using the weight loss method, the electrochemical impedance, the polarization, and the scanning electron microscopy. Polarization investigations showed that the studied diimine inhibitor delays both the cathodic and anodic reactions over chemical adsorption and blocks the active corrosion sites. The adsorption procedure was performed physically as best estimated using the Langmuir adsorption isotherm. It was observed that, the adsorption process was spontaneous and exothermic in the direction of a rise in the bulk phase entropy. The efficiency of the inhibitor was reduced by increasing temperature and raised with an increasing amount of the inhibitor. Impedance data indicated that as the inhibitor amount enhanced the charge transfer resistance of steel also increased while the double layer capacitance decreased. Kinetic and thermodynamic factors such as the activation energy, enthalpy, entropy and the Gibbs free energy of activation and adsorption were computed. Scanning electron microscopy was utilized to examine the steel surface in the presence or the absence of the inhibitor, showing excellent surface protection by the studied inhibitor.

中文翻译：

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X80钢上合成的二亚胺基化合物在不同温度下的酸性油气井处理液中的电化学和耐腐蚀性能

摘要-

绿色化合物N，N研究了′-双（2,4,6-三羟基苯甲醛）-2,2-二甲基丙二胺作为X80钢的酸腐蚀抑制剂。15％HCl水溶液用于模拟各种温度下的油井酸化流体。使用重量损失法，电化学阻抗，极化和扫描电子显微镜评价抑制性能。极化研究表明，所研究的二亚胺抑制剂在化学吸附上延迟了阴极和阳极反应，并阻止了活性腐蚀部位。使用Langmuir吸附等温线以最佳方式进行物理吸附。观察到，吸附过程是自发的并且在体相熵的增加方向上放热。抑制剂的效率随着温度的升高而降低，并随着抑制剂量的增加而提高。阻抗数据表明，随着抑制剂用量的增加，钢的电荷转移电阻也增加，而双层电容降低。计算了动力学和热力学因素，例如活化能，焓，熵和活化和吸附的吉布斯自由能。利用扫描电子显微镜检查在存在或不存在抑制剂的情况下的钢表面，被研究的抑制剂显示出优异的表面保护。计算了动力学和热力学因素，例如活化能，焓，熵和活化和吸附的吉布斯自由能。利用扫描电子显微镜检查在存在或不存在抑制剂的情况下的钢表面，显示出所研究的抑制剂具有优异的表面保护作用。计算了动力学和热力学因素，例如活化能，焓，熵和活化和吸附的吉布斯自由能。利用扫描电子显微镜检查在存在或不存在抑制剂的情况下的钢表面，显示出所研究的抑制剂具有优异的表面保护作用。