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Effect of S-AITA on Mild Steel Corrosion in Acidic Medium

V-Chandrasekaran|J. Saravanan
한국재료부식학회 (The Corrosion Science Society of Korea)|2006.10|CORROSION SCIENCE AND TECHNOLOGY|제5권 제5호|pp. 160-167

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주제분류금속공학

초록

Abstract

S-Acetyl Isothiourea Acetate (S-AITA) was synthesized in the laboratory and this influence on the inhibition of corrosion of mild steel in 1.11 N hydrochloric and 1.12 N sulphuric acids was investigated by weight loss and potentiostatic polarization techniques at 303K, 353K and 403K. These results were confirmed by the impedance technique. The inhibition efficiency increased with increase in concentration of inhibitor and decreased with rise in temperature from 303K to 403K. The maximum inhibition efficiency of S-AITA was found to be 99.95% (0.5% of S-AITA) at 303K in sulphuric acid. The adsorption of this compound on the mild steel surface from the acids has been found to obey Temkin's adsorption isotherm. The potentiostatic polarization results revealed that S-AITA was a mixed type inhibitor. Some thermodynamic parameters i.e., activation energy (Ea), free energy of adsorption (ΔGads), enthalpy of adsorption (ΔH) and entropy of adsorption (ΔS) were also calculated from weight loss data.

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