Potentiostatic techniques have been employed to study the polarisation behaviour of pure silver in 0·1M KNO3 solutions containing different concentrations of n-propionic acid. The non- Tafel nature of the polarisation curves obtained has been explained in terms of the influence of the potential of zero charge on the electrosorption characteristics of silver. The non- Tafel polarisation behaviour of iron in 1M H2SO4 solutions containing thiourea as inhibitor isdiscussed in the light of observations made on the silver electrodes. It has been observed that the Tafel extrapolation method fails to give valid corrosion rates for iron in sulphuric acid containing thiourea.
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