The influence of metal complexes of Tetramethyldithio-oxamide on the rate of acid corrosion of steel

Abstract

The corrosion rate of mild steel in 1 M H2SO4 containing tetramethyldithio-oxamide with or without addition of Fe(II), Co(II), Ni(II), Sn(II) was determined over a temperature range 20-80°C. Invariably, the rate of corrosion in media, with only tetramethyldithio-oxamide added, was 1.2-1.8-fold lower than in media to which metal ions had also been introduced. This fact was proved to be the result of the formation of coordination complexes M2+ (TMDTO)2.