Attri Rimjhim, Singh Amanpreet, Kaur Jasdeep, Singh Gurjaspreet, Saxena Akhil, Khalid Mohammad, Albakri Ghadah Shukri
Department of Chemistry, UIS, Chandigarh University, Mohali, Punjab 140413, India.
Department of Chemistry, Research & Incubation Centre, Rayat Bahra University, Chandigarh-Ropar NH 205, Greater Mohali, Punjab, 140103, India.
Int J Biol Macromol. 2025 Sep;321(Pt 3):146391. doi: 10.1016/j.ijbiomac.2025.146391. Epub 2025 Jul 29.
Chitosan, a biodegradable and non-toxic biopolymer, has shown promising potential in corrosion inhibition applications. Traditional corrosion inhibitors for mild steel often rely on toxic and expensive organic or inorganic compounds, prompting a shift toward eco-friendly alternatives. In this study, we developed a green corrosion inhibitor based on a chitosan-carbon quantum dot (CQD) hydrogel, leveraging the excellent optical properties and functionalization potential of biomass-derived CQDs. It was found that the hydrogel effectively inhibited mild steel corrosion in 1 M H₂SO₄ when tested using weight loss analysis, potentiodynamic polarization, and electrochemical impedance spectroscopy. At an optimum concentration of 40 ppm, the hydrogel achieved a highest inhibition efficiency of 89.22 % (EIS), 83.63 % (PDP), and 82.60 % (weight loss), indicating strong surface protection. However, at 35 °C, the efficiency decreased to 77.20 % (weight loss), indicating a reduction in performance with rising temperature. Surface characterisation using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), verified the existence of the protection film on the mild steel surface, elucidating the inhibition mechanism. This study demonstrates the potential of CQD-chitosan hydrogel as a cost-effective and environmentally benign corrosion inhibitor.
壳聚糖是一种可生物降解且无毒的生物聚合物，在缓蚀应用中显示出了良好的潜力。传统的低碳钢缓蚀剂通常依赖于有毒且昂贵的有机或无机化合物，这促使人们转向环保型替代品。在本研究中，我们基于壳聚糖 - 碳量子点（CQD）水凝胶开发了一种绿色缓蚀剂，利用了生物质衍生的CQD优异的光学性质和功能化潜力。通过失重分析、动电位极化和电化学阻抗谱测试发现，该水凝胶在1 M H₂SO₄中能有效抑制低碳钢腐蚀。在最佳浓度为40 ppm时，水凝胶的最高缓蚀效率分别为：89.22%（电化学阻抗谱）、83.63%（动电位极化）和82.60%（失重），表明具有强大的表面保护作用。然而，在35°C时，失重法测得的缓蚀效率降至77.20%，表明性能随温度升高而降低。使用扫描电子显微镜（SEM）和X射线光电子能谱（XPS）进行的表面表征，证实了低碳钢表面存在保护膜，阐明了缓蚀机理。本研究证明了CQD - 壳聚糖水凝胶作为一种经济高效且环境友好的缓蚀剂的潜力。
