Abstract
It has been observed from weight loss and hydrogen gas evolution measurements that 4-phenylsemicarbazide (4PSC) and semicarbazide (SC) actually have very significant effects on the corrosion of mild steel in hydrochloric acid. 4PSC and SC tend to inhibit the corrosion of mild steel in hydrochloric acid to a remarkable extent, with 4PSC exhibiting a higher maximum inhibition efficiency (82%) than that of SC (66%). Generally, the inhibition was found to increase with increase in inhibitor concentration and in half-life, but with a decrease in temperature and decrease in the first-order rate constants obtained at 30°C and 40°C. The Physisorption mechanism of adsorption has been proposed for the inhibitors and the difference observed in the inhibition behaviour of the compounds has been explained. The compounds also obey the Freundlich adsorption isotherm equation.
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