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Synergistic study of corrosion inhibition of sulphadoxine and pyrimethamine on mild steel in acidic medium

I.A.Akpan, N.O.Offiong

The synergistic effect of an antimalarial drug sold under the trade name “Antimal”, a combination of sulphadoxine and pyrimethamine, which contains nitrogen, oxygen and sulphur atoms in theirmolecular structure, was studied as a low cost and ecofriendly corrosion inhibitor for mild steel in 0.1M HCl solution at room temperature by weight loss technique. The results obtained show that the drug has promising inhibitive properties at all concentrations considered in this study. The inhibition efficiency was also found to increase with increase in the concentration of the inhibitor. Amechanismfor the inhibitive action of the drug as well as its kinetics has also been proposed.