Abstract
The kinetics of the anodic dissolution of Armco iron and high-strength ferritic cast iron is investigated in an oxalic-acid medium at different pH values. It is shown that passivation occurs with the participation of secondary and electrochemical mechanisms and the formation of ferrous oxalate film. It is ascertained that hydro-oxalate ions participate in the electrode process with the reaction order equal to 0.5. The proposed mechanism of anodic dissolution of Armco iron and high-strength ferritic cast iron includes the stages of the formation of passivating film and Fe2+ions. The latter, accumulating in a near-electrode layer, promote the passivation of metal by the mechanism of secondary crystallization.
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