발간논문

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Vol.14, No.3, 270 ~ 279, 1976
Title
Potentiodynamic Polarization Behavior of 304 Stainless Steel in acidic Ferric Sulfate Solutions
윤승열 S . R . Yoon
Abstract
Potentiodynamic polarization behavior of 304 stainless steel has been recorded with a scan rate of 600mV/min in 25℃, stagnant 10 v/o sulfuric acid solutions containing various concentrations of ferric ion. The shape of the polarization curves was changed in that manner generally predicted by the mixed potential theory, but analyses of them revealed that the adsorption of ferric ion on the electrode surface was occurring. Reduction of ferric ion proceeded at a diffusion limited rate over a wide range of electrode potential. The passive film once formed in the course of potential scan from active to noble side appeared so stable as to reduce the active peak current to a small value during the repeated potential scan. Some electrochemical parameters related to the dissolution of passive film by ferric ion was also examined. Active peak potential and oxygen evolution potential were little changed with the addition of ferric ion in the limit of experimental error.
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