溶融酸化物に覆われた鉛と鉄の気相による酸化速度と外部電流の影響

概要

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A certain quantity of liquid PbO, PbO-SiO_2, Na_2O-B_2O_3 or Na_2O-GeO_2 has been put on liquid lead or solid iron in a crucible suspended from a thermobalance and then oxidized under air or O_2-Ar mixtures at 900 to 1000℃. The effect of supplied currents upon the rates has also been determined by the thermobalance. The following results were obtained. When no current was supplied, the oxidation rate of liquid lead obeyed the parabolic law. The rate was increased with increase of temperature and the partial pressure of oxygen in gases and decreased with the increase of SiO_2 content in PbO-SiO_2 melts. When solid iron was oxidized through Na_2O-B_2O_3 and Na_2O-GeO_2, no change in weight could be measured because of very small oxidation rate. When liquid lead covered with PbO-SiO_2 and solid iron covered with Na_2O-B_2O_3 were oxidized with galvanostatic currents, the rates were accelerated by the currents and satisfied Faraday's relation at 900 to 1000℃ and with the currents less than 400 mA. At lower temperature, however, the rates deviated from Faraday's relation even with smaller currents.
社団法人日本鉄鋼協会の論文
1973-03-01