溶融アルカリ金属珪酸塩-固体白金界面の直流分極

概要

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Galvanostatic polarization measurements were made at 1350℃ on a solid platinum-molten alkali silicate interface. From the analysis of the initial decay up to 80μsec of the overpotential-time curves, the exchange current density has been determined as a function of the M_2O/SiO_2 molar ratio (M=Li, Na and K) and the oxygen partial pressure. (PO_2=1, 0.21 and 0.03 atm) The exchange current density has been found to increase with increasing the M_2O/SiO_2 molar ratio and the oxygen partial pressure. Subsequent decay up to 1 msec, 10 msec, 100 msec, 1 sec and 5 sec∿of the overpotential curves has been studied on the assumption that mass-transfer controls the rate of the oxygen discharge reaction. At the constant M_2O/SiO_2 molar ratio, the slope in the overpotential-square root of time plots has been shown to be inversely proportional to the square root of an oxygen pressure. It was also found that the product of the solubility of and the square root of the diffusivity of soluble oxygen and oxygen ion increases with the increase of the M_2O/SiO_2 molar ratio. The product also increases with changing M_2O from Li_2O to Na_2O to K_2O in this order at a constant M_2O/SiO_2 molar ratio.
社団法人日本鉄鋼協会の論文
1977-05-01