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

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.

Phytochemical Study of Some Plant Extracts to Assess their Synergistic Corrosion Inhibition Performance-A Comparative Analysis

“…Comparative study of the inhibitory effects of various parts of plants (leaves, fruits, barks, nuts, and seeds) have been conducted on mild steel, and stainless steel in acidic, alkaline, and neutral media using Gravimetric methods (weight loss), Potentiodynamic polarization (PDP) and Electrochemical impedance spectroscopy (EIS) techniques [43][44][45] . These studies have reported high inhibition e ciencies with inhibition e ciency increasing with increasing inhibitor concentration 40,[48][49][50][51][52][53] . Prior work indicates that the adsorption of plant extracts on mild and stainless-steel takes place by either physisorption and/or chemosorption depending on the plant extract phytochemicals and the corrosive media 31,42,54,55 .…”