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Vol.19, No.7, 543 ~ 552, 1981
Title
The Effect of Oxygen on the Corrosion of Armco Iron In Molten LiCl - KCl Eutectic Salt
박녕우Young Woo Park, 윤승열Seung Ryul Yoon
Abstract
Effect of oxygen on the corrosion of Armco iron in molten LiCl-KCl eutectic salt at 450℃ was studied by electrochemical techniques. All the experimental work was carried out in an inert atmosphere glove box, equipped with a specially designed electrolysis cell system. Results clearly showed the existence of active-passive transition for Armco iron corrosion in the melt and also the dependence of corrosion rate and potential upon the oxygen limiting diffusion current. Above 0.25V of electrode potential refered to Ni/Ni₃S₂/S^(--) reference electrode, main partial anodic reaction appeared to be Fe →Fe^(+3)＋3e and showed clear Tafel linearity with slope of about 80 mV/dec. Corrosion rate was increased in proportion to 1/5 power of oxygen partial pressure. Other electrochemical parameters related to the corrosion reaction were also discussed based on the mixed potential theory and electrode kinetics.
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