ChemInform Abstract The anodic behavior of a carbon steel rotating disk electrode in deaerated 1-9 N NaOH solutions at 25-80 rc C is examined over a potential range from active to transpassive potentials. The soluble dissolution products are analyzed using a rotating ing-hemisphere electrode. The electrochemical reactions of various stages of iron oxidation are: 1. steel dissolution via 2e-transfer forming HFeO2-in the active regime, 2. dissolution to form HFeO2-and FeO2-in the neighborhood of active-passive transition potential, 3. ormation of a protective Fe3O4 film at the active-passive transition potential, 4. oxidation of the film to a Fe2O3 film during the current drop from active to passive state, 5. dissolution of the Fe2O3 film in > 4 N NaOH solutions at temp. > 40 rc C and anodic dissolution of the exposed steel to form FeO2-, 6. limitation of the dissolution at high overpotentials by mass transfer of FeO2-to the bulk electrolyte, and at low overpotentials by the ohmic resistance of an intermediate Fe(OH)3 surface layer.
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