Dalhatu Sani Nazifi, Modu Kolo Alhaji, Mahmoud Auwal Adamu, Zango Zakariyya Uba, Umar Abdullahi Bello, Usman Fahad, Dennis John Ojur, Alsadig Ahmed, Ibnaouf Khalid Hassan, Aldaghri Osamah A
Department of Chemistry, Faculty of Science, Abubakar Tafawa Balewa University, Bauchi 740101, Nigeria.
Department of Chemistry, Faculty of Science, Kano University of Science and Technology, Wudil 713281, Nigeria.
Polymers (Basel). 2023 Jan 12;15(2):398. doi: 10.3390/polym15020398.
Corrosion prevention has been a global phenomenon, particularly in metallic and construction engineering. Most inhibitors are expensive and toxic. Therefore, developing nontoxic and cheap corrosion inhibitors has been a way forward. In this work, L-arginine was successfully grafted on chitosan by the thermal technique using a reflux condenser. This copolymer was characterized by Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The corrosion inhibition performance of the composite polymer was tested on mild steel in 0.5M HCl by electrochemical methods. The potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) results were consistent. The inhibition efficiency at optimum concentration rose to 91.4%. The quantum chemical calculation parameters show good properties of the material as a corrosion inhibitor. The molecular structure of the inhibitor was subjected to density functional theory (DFT) to understand its theoretical properties, and the results confirmed the inhibition efficiency of the grafted polymer for corrosion prevention.
腐蚀防护一直是一个全球性的现象，尤其是在金属和建筑工程领域。大多数抑制剂价格昂贵且有毒。因此，开发无毒且廉价的腐蚀抑制剂是一条前进的道路。在这项工作中，L-精氨酸通过使用回流冷凝器的热技术成功接枝到壳聚糖上。该共聚物通过傅里叶变换红外光谱（FTIR）、热重分析（TGA）和X射线衍射（XRD）进行表征。通过电化学方法在0.5M盐酸中对低碳钢测试了复合聚合物的缓蚀性能。动电位极化（PDP）和电化学阻抗谱（EIS）结果一致。最佳浓度下的缓蚀效率升至91.4%。量子化学计算参数表明该材料作为腐蚀抑制剂具有良好的性能。对抑制剂的分子结构进行密度泛函理论（DFT）研究以了解其理论性质，结果证实了接枝聚合物的防腐蚀缓蚀效率。
