Chemically modified natural polysaccharide as green corrosion inhibitor for mild steel in acidic medium

► Polyacrylamide grafted with Okra mucilage is a biodegradable co-polymer. ► It is an effective green corrosion inhibitor for mild steel in 0.5 M H2SO4. ► The inhibition efficiency is both concentration and time dependent. ► It acts as a predominantly cathodic inhibitor. ► Physically adsorbed polymer film on the metal surface restricts the corrosion.