Synergistic effect of a composition of dextrin and sodium isoascorbate on carbon steel corrosion inhibition in a chloride-containing environment

The corrosion inhibition of carbon steel by an environmentally safe inhibitory composition based on dextrin and sodium isoascorbate was studied using potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X-ray analysis. The results showed that the corrosion protection efficiency of carbon steel in a 0.1% sodium chloride solution exceeds 90%. The protective mechanism of the composition is likely attributed to the adsorption of dextrin molecules through coordination bonds between its hydroxyl groups and the metal surface. The compaction of the protective organic film is further enhanced by the formation of poorly soluble chelate compounds between ascorbate anions and iron cations. The developed composition, derived from renewable plant-based raw materials, can provide effective corrosion protection for steel structures and products in neutral corrosive environments.