Abstract
Abstract Steady state polarization curves were obtained on mild steel wires along with film stripping and mass balance measurements in mixed solutions of Na2SO4, NaClO3, and NaClO4. It was found that the anodic film on steel in Na2SO4 is electronically conducting with the transpassive current being consumed in O2 evolution. When NaClO4 was added to the Na2SO4 solution, the transpassive region was lowered by about 500 mV, the presence of a surface film was undetected, and the current was consumed in metal dissolution. The film on steel in NaClO3 was a uniform porous layer with less conductivity than that in Na2SO4. When NaClO4 was added to the NaClO3 solution, the anodic film was not dissolved as readily in the transpassive region and uneven metal removal was observed on the steel samples. The results were interpreted in terms of the dissolution of anodic films in the transpassive region by an ion exchange process between the oxide ions of the film and the anions adsorbed from solutions on the film.
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