Electrochemistry and Corrosion Laboratory, Physical Chemistry Department, National Research Centre, Dokki, Cairo 12622, Egypt; Material Engineering Lab, Central Laboratories Network, National Research Centre, Dokki, Cairo 12622, Egypt.
Chemistry of Natural & Microbial Products Department, Pharmaceutical and Drug Industries Research Institute, National Research Center, Cairo, Egypt.
Int J Biol Macromol. 2024 Apr;263(Pt 1):130133. doi: 10.1016/j.ijbiomac.2024.130133. Epub 2024 Feb 13.
This study aims to explore the prevention of chitosan modified with a fused heterocyclic compound as a sustainable corrosion inhibitor for mild steel in 1 M HCl. Electrochemical instruments, including potentiodynamic polarization techniques, and electrochemical impedance spectroscopy (EIS), were employed to evaluate the corrosion protection performance. The outcomes showed that the chitosan modified with a fused heterocyclic compound has outstanding inhibition performance, with an inhibition effectiveness of 98.25 % at 100 ppm. The anti-corrosion features of modified chitosan were ascribed to the presence of hetero atoms in modified chitosan composite which leads to the creation of a protective layer, The modified chitosan composite behaved as mixed-typed inhibitors, as shown by the PDP results. The modified chitosan composite adsorbs on mild steel in the investigated corrosive media via chemisorption interactions, and its adsorption followed the Langmuir adsorption model. Furthermore, increasing the temperature from 303 to 333 K enhanced the corrosion rate, most likely due to the desorption of the inhibitor agent from the steel surface.
本研究旨在探索壳聚糖的改性方法，将其与融合杂环化合物结合作为一种可持续的缓蚀剂，用于保护低碳钢在 1M HCl 中的腐蚀。电化学仪器，包括动电位极化技术和电化学阻抗谱（EIS），被用于评估腐蚀防护性能。结果表明，壳聚糖与融合杂环化合物的改性具有出色的抑制性能，在 100ppm 时抑制效率达到 98.25%。改性壳聚糖的抗腐蚀特性归因于改性壳聚糖复合材料中杂原子的存在，这导致了保护层的形成。根据 PDP 结果，改性壳聚糖复合材料表现为混合型抑制剂。在研究的腐蚀性介质中，改性壳聚糖复合材料通过化学吸附相互作用吸附在低碳钢表面，其吸附符合 Langmuir 吸附模型。此外，从 303K 升高到 333K 会增加腐蚀速率，这很可能是由于抑制剂从钢表面解吸所致。
