高炉出銑樋材のスラグ-溶銑界面における局部溶損におよぼす諸因子の影響

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An investigation has been made on local corrosion rate of clay-bonded SiC specimen at the CaO-Al_2O_3-SiO_2 slag-liquid iron alloy interface. The local corrosion rate increases linearly with increasing dipping time. The corrosion rate is negligible small in the melt saturated with carbon and increases markedly with decreasing carbon concentration. After reaching maximum, it decreases slightly with further decreasing the carbon concentration. The corrosion rate increases with increasing temperature and number of revolution of the specimen. Aluminum addition to the metal increases markedly the corrosion rate, while silicon addition decreases it. The local corrosion does not proceed in carbon-saturated iron, but proceeds rapidly by an addition of aluminum to the metal or by rotating the specimen. The corrosion rate increases remarkably with decrease in SiO_2 concentration in the lower carbon concentration range of the metal. These behaviors of the corrosion rate are explained by the mechanism that the local corrosion is caused by the active motion of a thin slag film between specimen and metal phase induced by Marangoni effect and by CO bubbles evolved at slag film-metal interface. The main rate determining step is estimated to be the removing process of the following corroded products, that is, carbon particles in the slag film produced by oxidation of SiC in near the saturated carbon concentration and the clay dissolved from specimen into the film in the lower carbon concentration range.
社団法人日本鉄鋼協会の論文
1986-03-01

高炉出銑樋材のスラグ-溶銑界面における局部溶損におよぼす諸因子の影響

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