Experimental study on corrosion inhibition of 304 SS in acid solution

Inhibition is one of the mechanisms used for preventing acid corrosion of metals and alloys. The present work focus on investigating the inhibiting effect of N-furfury^l-N^l-pheny^l thiourea (FPTU) on the corrosion of 304 SS in 1M HCl solution using the Tafel extrapolation and electrochemical impedance spectroscopy (EIS) techniques. The study reveals that FPTU acts as a mixed inhibitor, and good inhibition efficiency (> 92%) is observed even at elevated temperatures. The study also reveals that FPTU physically adsorbed on the steel surface, and abeys Temkin’s adsorption isotherm. It is evident from the study that the results of the Tafel extrapolation method and electrochemical impedance technique, obtained for the corrosion of 304 SS are in good accord. Since the compound investigated is highly effective in the range of temperatures and concentrations studied, it can be effectively used as inhibitor for mitigating the corrosion of steel in HCl medium.