Assessing the newly synthesized bio-based amylase-chitosan/cellulose nanocrystals- ZnO composite for enhanced corrosion protection of carbon steel in acidic medium

The development of eco-friendly corrosion inhibitors is critical in addressing the environmental concerns associated with synthetic coatings. Corrosion in carbon steel, particularly in acidic environments, remains a significant challenge, as traditional coatings often lack durability and sustainability. This study explores the use of bio-based nanocomposite coatings made from amylase-chitosan (AS-CIT), cellulose nanocrystals (CNC), and Zinc oxide (ZnO) nanoparticles. Electrochemical testing, quantum chemical analysis, and Monte Carlo simulations were employed to evaluate the coating's performance. Results indicate that incorporating 0.1 g of ZnO into the nanocomposite achieved a maximum inhibition efficiency of 95.31 %, with strong surface adhesion and enhanced protection against corrosive ions. Additionally, theoretical investigations revealed improved electron donor-acceptor interactions, contributing to the formation of a stable passivation layer. Surface morphological investigations also proved the effectiveness of the coating. Consequently, this bio-based nanocomposite proved to be an effective anticorrosive product. This research offers a novel, sustainable solution for corrosion protection, utilizing agricultural residues while maintaining high performance.