Al-Amiery Ahmed A, Mohamad Abu Bakar, Kadhum Abdul Amir H, Shaker Lina M, Isahak Wan Nor Roslam Wan, Takriff Mohd S
Renewable Energies and Technology Energy Center, University of Technology-Iraq, Baghdad, 10001, Iraq.
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia.
Sci Rep. 2022 Mar 18;12(1):4705. doi: 10.1038/s41598-022-08146-8.
The corrosion performance of mild steel (MS) in 1M HCl solution was examined by weight loss (WL), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), and open circuit potential (OCP) measurements in the absence and presence of nonanedihydrazide. PDP measurements indicated that nonanedihydrazide acts as a mixed inhibitor due to its adsorption on the MS surface, exhibiting an inhibition efficiency of more than 97%. The surface morphology investigation of the protective layer on the MS surface confirmed that adsorption of nonanedihydrazide molecules occurred via chemical adsorption following Langmuir's isotherm model. The effect of temperature on the corrosion performance in the presence of nonanedihydrazide was investigated in the range of 303-333 K, showing that the inhibition efficiency increased with an increase in the inhibitor concentration and decreased with an increase in temperature. A new green corrosion inhibitor was synthesised and theoretical computations were conducted to completely understand the inhibition mechanism. Nonanedihydrazide molecules were investigated by DFT (density functional theory) using the B3LYP functional to evaluate the relationship of corrosion inhibition performance and the molecular structure. The computed theoretical parameters presented significant support for understanding the inhibitive mechanism revealed by the inhibitory molecules and are in good agreement with WL, PDP, EIS, (EFM), and OCP results.
通过失重法（WL）、动电位极化法（PDP）、电化学阻抗谱（EIS）、电化学频率调制法（EFM）和开路电位（OCP）测量，研究了低碳钢（MS）在1M盐酸溶液中，在不存在和存在壬二酰二肼的情况下的腐蚀性能。动电位极化测量表明，壬二酰二肼由于其在低碳钢表面的吸附而作为一种混合型缓蚀剂，缓蚀效率超过97%。对低碳钢表面保护层的表面形貌研究证实，壬二酰二肼分子的吸附遵循朗缪尔等温线模型通过化学吸附发生。在303-333K范围内研究了温度对存在壬二酰二肼时腐蚀性能的影响，结果表明缓蚀效率随缓蚀剂浓度的增加而增加，随温度的升高而降低。合成了一种新型绿色缓蚀剂，并进行了理论计算以全面了解其缓蚀机理。使用B3LYP泛函通过密度泛函理论（DFT）研究了壬二酰二肼分子，以评估缓蚀性能与分子结构之间的关系。计算得到的理论参数为理解缓蚀分子揭示的缓蚀机理提供了重要支持，并且与失重法（WL）、动电位极化法（PDP）、电化学阻抗谱（EIS）、电化学频率调制法（EFM）和开路电位（OCP）的结果高度一致。
