Adsorption and corrosion inhibition properties of thiocarbanilide on theudelectrochemical behavior of high carbon steel in dilute acid solutions

摘要

The inhibition performance of thiocarbanilide on the electrochemical corrosion behavior of high carbonudsteel in 1 M H2SO4 and HCl acid solutions was studied through weight loss method and potentiodynamicudpolarization test. Data obtained showed that the organic compound performed effectively in acid solutionsudat all concentrations with an average thiocarbanilide inhibition efficiency above 70% in H2SO4 acidudand 80% in HCl acid from weight loss and potentiodynamic polarization test respectively. Results fromudcorrosion thermodynamic calculations showed that the adsorption of thiocarbanilide onto the steeludwas through chemisorption mechanism whereby the redox electrochemical process responsible for corrosionudand the electrolytic transport of corrosive anions were simultaneously suppressed. Statisticaludderivations through ANOVA analysis confirm that the influences of both the inhibitor concentrationudand exposure time on inhibition efficiency values are negligible. Adsorption of the compound was determinedudto obey the Langmuir and Frumkin isotherm model