Restricted accessResearch articleFirst published online 1969-5
Stability of the Oxide Film on Metals in Relation to Inhibition of Corrosion: II* Dual Role of the Anion in the Inhibition of the Corrosion of Mild Steel
It has been found that anions have a dual role in relation to the stability of the oxide film on mild steel. They contribute both to the destruction of the oxide film and to the passivation process in which the film is stabilised. The dependence of these functions on concentratinn differs, so that the aggressive action predominates at low concentrations and the inhibitive action at high concentrations. The change from aggressive action to passivation occurs at a concentration specific to each anion. In many cases at a certain critical concentration either result may ensue. A list is given of anions in order of aggressiveness towards the oxide film.
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