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Abstract
The anodic behaviour of iron and steel in N/10 and N/100 NaOH solution in the presence of chloride and sulphate ions has been studied by the potentiokinetic polarization method. Anodic passivation of iron in NaOH is revealed by a fall in the anodic current after it reaches a maximum value. Behaviour in NaOH solution in the presence of chloride ions is similar to that obtained in NaOH solution up to a Cl : OH ratio of 1 : 1 but the passivation current is increased when the chloride concentration exceeds this ratio, and a breakdown of passivity is observed only at higher chloride concentration. SO 4 staggered2− ions do not effect any change in the passivation behaviour of iron in 0·1 N NaOH up to the highest ratio studied (SO 4 staggered2− : OH − = 20: 1).
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