Inhibition of Acid Corrosion of Mild Steel by Pyridoxal and Pyridoxol Hydrochlorides

The action of pyridoxal hydrochloric (PXA) and pyridoxol hydrochloride (PXO) on the corrosion of mild steel in hydrochloride acid (HCl) solution was studied using the weight loss and gasometry methods. The percentage inhibition efficiencies increase with the concentration of the inhibitors and decrease with increase in temperature. The efficiencies increase in the order PXO > PXA. The kinetic treatment of the results gave first order kinetics. The relative inhibitive efficiency of these compounds has been explained on the basis of structure dependent – electron donor properties of the inhibitors.