Corrosions inhibitions of milds steelsin hydrochloricsacid solutionsby an isatinaniline compound

Abstract

Recently the researchers go to the eco-friendly corrosion inhibitors.In the present investigation, isatin which found in many plants, Isatis tinctoria,Calanthe discolor and Couroupita guianensis has been used as corrosioninhibitor. An isatin-aniline compound, namely ethyl 4-amino-N-(3-isatinyl)benzoate (AIB), was successfully synthesized in high yield and its inhibitionimpact on corrosion of MS (mild steel) in hydrochloric acid as corrosivesolution was examined via weight loss and Scanning electron microscopetechniques. The results acquired appeared that AIB has employ perfect as acorrosion inhibitor at low concentrations towards mild steel in HCl bath. Theimpact of temperature on the corrosion behavior of MS in corrosive bath withpresence of (250) ppm of AIB has been investigated in the range oftemperatures (303-333) K. The thermodynamic parameters for inhibitingprocess were investigated to find out the mechanism of corrosion inhibition ofMS acid bath.