Encapsulation of Acacia Bark Extract ( Acacia mangium) ) by MaltodextrinCarrageenan for Corrosion Inhibition Steel in Sulfuric Acid Medium

Research shows that encapsulation of acacia bark extract with maltodextrin-carrageenan (1:1) effectively inhibits mild steel corrosion in a 0.75 M sulfuric acid solution. To study the inhibition efficiency and adsorption properties using the weight loss method with varying concentrations starting from 0.5 g/L to 2.5 g/L and temperature variations from 303 K to 333 K. The results showed that a higher encapsulation concentration of acacia bark extract caused a lower corrosion rate and higher inhibition efficiency. Adsorption of inhibitors on the mild steel surface follows the Freundlich isotherm. Thermodynamic adsorption parameters show that adsorption occurs spontaneously with increasing temperature. The encapsulation adsorption process of acacia bark extract on the surface of mild steel is exothermic and shows the irregularity of the adsorption process on the steel surface.