Three aliphatic and three aromatic sulphoxides (dimethyl di-n-butyl, tetramethylene, dibenzyl, diphenyl, and di-p-tolyl sulphoxide) have been tested for their ability to inhibit the corrosion of iron in a 1 N solution of H2SO4, and their anti-corrosive activity has been correlated with their chemical constituiion. The anodic and cathodic polarisation curves and the corrosion rates are explained by assuming that sulphides formed by the reduction of the sulphoxides. inhibit corrosion. The anti-corrosive activity of these sulphoxides is influenced by the electron density on the sulphur atom and their rate of reduction to sulphide.
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