Development of Biochar-Based Sustainable Corrosion-Resistant Coating

Coating technology involves the application of a thin layer of material onto a substrate to enhance its surface properties, including protection, functionality, and aesthetics. Coatings can be made from various materials such as polymers, pigments, additives, and solvents, depending on the intended application. These coating layers serve multiple purposes, such as providing corrosion resistance, improving wear durability, reducing friction, or offering thermal and electrical insulation. The development of sustainable coating technologies is essential to addressing environmental, economic, and social challenges associated with conventional coatings. Traditional coatings often rely on petroleum-based resources and volatile organic compounds (VOCs), contributing to greenhouse gas emissions, air pollution, and health hazards. As global industries strive to reduce their environmental carbon footprint, the demand for eco-friendly coating alternatives has grown significantly.

Therefore, a biochar-based sustainable coating has been developed to achieve a sustainable alternative for conventional coatings. Biochar from different sources of biomasses were prepared by pyrolysis at varying conditions and characterized by FTIR, FESEM, BET, XRD, etc. Derived biochar offers unique properties such as high thermal stability and chemical inertness, making it an effective component for corrosion protection. When this biochar is incorporated into coating formulations, it forms a barrier that inhibits the diffusion of corrosive agents like water, oxygen, and chlorides to metal surfaces. Additionally, the carbon-rich structure of biochar enhances the durability of coatings and provides cathodic protection, reducing metal oxidation rates. These coatings have potential applications in industries such as the infrastructure, marine, and automotive sectors, where corrosion resistance is critical. Beyond these benefits, biochar-based coatings promote environmental sustainability by utilizing renewable biomass resources and reducing reliance on petroleum-based materials. However, further research is needed to optimize coating techniques and evaluate the long-term stability and environmental impacts of biochar-coated products.