Abstract

Corrosion inhibition studies of mild steel in dimethyl sulfoxide containing HCl have been performed at 25°C using dithiobiurets and their triphenyltin- and dibutyltin complexes as inhibitors. The inhibition efficiency (IE) of these compounds was evaluated by electrochemical polarization technique. Among the ligands, best performance was exhibited by ethoxyphenyl derivative. The IE values of the ligands enhanced appreciably on complexation. Triphenyltin complexes behaved as better corrosion inhibitors than their dibutyltin analogues. Surface studies of samples inhibited by ethoxyphenyl dithiobiuret and its organotin complexes have been made by SEM.

Key words: Mild steel, DMSO-HCl, organotin dithiobiurets.