Corrosion inhibition studies of mild steel in 1.0 N sulphuric acid have been performed at 25 deg C using substituted thiobiurets and their molybdenum and tungsten complexes as inhibitors. All the inhibitors have been found to inhibit the corrosion process by getting adsorbed on the metal surface. Among the studied thiobiurets, methoxyphenyl derivative behaved as the best corrosion inhibitor. The inhibitive properties of thiobiurets improved considerably on complexation with molybdenum and/or tungsten ions.
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