The results presented here show the effectiveness of thiosemicarbazide (TSC) as an inhibitor for acid corrosion of iron. The percentage inhibition has been found to increase with concentration up to a maximum of ca. 95% for 10-2M inhibitor. Cathodic polarization measurements showed that TSC is a cathodic inhibitor and that its adsorption in the double layer does not change the mechanism of the hydrogen evolution reaction although it significantly reduces its rate. The degree of coverage was calculated from the shift in the cathodic Tafel line and was found to be independent of potential, but increased with inhibitor concentration. The results are analyzed in terms of both molecular and cationic adsorption. © 1976.
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