Experimental Study of Corrosion Inhibition of Carbon Steel in Acidic Environment Using Natural Guar Gum

Abstract

Abstract Steel is considered as a versatile material due to intrinsic mechanical properties and potential technological applications. However, environmental exposure inevitably oxidize and cause catastrophic industrial failures. To mitigate the oxidation of steel, various prevention methods are adopted, which are toxic and expensive. Herein, an eco-friendly and inexpensive approach is studied to prevent carbon steel from oxidation in the HCl environment. Biodegradable, non-ionic and water-soluble green inhibitor containing hetero polysaccharides is prepared by using guar seeds. Electrochemical measurement studies reveal that guar gum creates a non-conductive adhesive layer between the metal and corrosive media by adsorbing on the metallic surface. Fourier transform infrared and surface analysis confirms the adsorption of guar gum molecules on the metal surface. Industrially viable Gravimetric analysis results provided a weight loss efficiency of 91% for 24 hours, which decreases with exposure time. Lastly, Temkin adsorption model is used to validate adsorption and resulting inhibition.