A review on chitosan and chitosan-based bionanocomposites: Promising biological macromolecules for sustainable corrosion inhibition.

Corrosion is a significant issue affecting industrial metal surfaces, resulting in material degradation, economic losses, and safety concerns. This review comprehensively examines chitosan and its nano and bionanocomposite forms as sustainable, eco-friendly corrosion inhibitors, emphasizing key innovations in their development and application. The article highlights chitosan's ability to form protective films, which inhibit corrosion by creating a barrier on metal surfaces. A key advancement explored is the incorporation of chitosan nanoparticles, which significantly improve corrosion resistance due to their enhanced surface area, increased adhesion properties, and improved mechanical strength. Another innovative aspect is the synergistic effect of combining chitosan with other nanoparticles or inhibitors, resulting in superior corrosion protection and enhanced barrier properties. The review also addresses the chemical modifications of chitosan to overcome challenges such as poor solubility, mechanical weakness, and chemical instability in harsh environments. A novel contribution of this article is the focus on scalable, cost-effective production methods for chitosan-based bionanocomposites, facilitating their industrial application. This review provides a comprehensive summary of literature reports, offering valuable insights into the latest research advancements and highlights future prospects for chitosan-based materials as eco-friendly, high-performance corrosion inhibitors in diverse industrial settings.