PbO-SiO2スラグ表面での固体SiO2の局部溶損部におけるスラグフィルムの運動

向井 楠宏, 原田 力, 中野 哲生, 平櫛 敬資

doi:10.2320/jinstmet1952.49.12_1073

Direct observation has been made of the film motion of liquid PbO-SiO₂ slags on solid silica in a local corrosion zone for rod and prism specimens by the aid of motions of very small bubbles floating on the film. During the early stage of local corrosion, the slag film forms characteristic flow patterns, principally composed of wide zones of rising film and narrow zones of falling film, according to the contour of the specimen. In the range where the local corrosion progresses markedly, rising and falling film velocities were determined in relation to vertical direction, dipping time, slag composition and shape of the specimen. Films of rising zone are thinner by several times than those of falling zone. Change in SiO₂ content in the solidified slag film is detected along the surface of the specimen in directions vertical to and also perpendicular to the surface. Forces participating in the film motion are surface tension gradient, gravity and pressure difference in the film. The pressure difference is caused by the difference in radius of cavature of the film surface formed along the contour of the specimen. Hydrodynamic analysis on the film motion results in good agreement between the calculated and observed film velocities. The analysis indicates an effective promotion of mass transport of dissolved component from the specimen by the active film motion in diffusion layer in the film, that is, break down of diffusion layer, which accerelates the local corrosion.

PbO-SiO<SUB>2</SUB>スラグ表面での固体SiO<SUB>2</SUB>の局部溶損部におけるスラグフィルムの運動

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