Exploration of coffee bean husks waste as an eco-environmentally friendly corrosion inhibitor on mild steel in sulphuric acid solutions

Coffee bean husks waste contains chemical compounds such as tannins and flavonoids. These compounds are known to inhibit corrosion. Corrosion inhibition of mild steel in 0.75 M H2SO4 has been investigated using the presence and absence of coffee bean husk extract (CBHE). The effect of inhibition efficiency and corrosion rate on extract concentration and immersion duration was studied using the method of weight loss. The inhibition efficiency increases and the corrosion rate decreases with increasing immersion time and the concentration of CBHE. The corrosion inhibition efficiency was obtained 97.54 % obtained at 72 hours immersion and addition of CBHE 10 g/L. Steel surface adsorption was examined by SEM and FTIR spectroscopy. CBHE is recommended as a good inhibitor.