日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 2 (1984),
pp. 181-190

Local Corrosion of Solid Oxides at the Surface of Liquid Slags

Tsutomu Harada1, Sh\=oichiro Fujimoto1 Akira Iwata2 and Kusuhiro Mukai3

1Kurosaki Refractories Co., Ltd., Kitakyushu
2Graduate Student, Kyushu Institute of Technology, Kitakyushu. Present address: Nippon Steel Corporation, Tokai
3Department of Metallurgy, Kyushu Institute of Technology, Kitakyushu

Abstract:

Local corrosion of solid oxides at the surface of liquid slags has been investigated in Ar atmosphere for the following systems: Mgo, Al2O3-(CaO-Al2O3-SiO2) slag, MgO-(CaO-Al2O3-SiO2-B2O3, P2O5) slag and SiO2-(CaO-FeO-SiO2) slag. Phenomena of the local corrosion observed for these systems and also SiO2-(PbO-SiO2) slag systems reported by the authors(1) are explained fundamentally from the standpoints of interfacial turbulence of creeping up slag film along the surface of the specimen above the slag surface and mass transfer of the dissolved component of the specimen in the bulk slag by density current and diffusion etc. Appearance of the local corrosion, that is, its shape and time variation of Δ ds-g, the linear loss of the specimen, have been classified, based on the characteristic physicochemical properties of each system, such as the surface tension of the slag, the density of the slag, the wettability of the system, the solubility of the solid oxide in the slag and the rate of corrosion, dΔ ds-g/dt.} \recdate198308{15


(Received )

Keywords:

local corrosion, magnesium oxide, aluminum oxide, silicon oxide, slag surface, liquid slags, interfacial turbulence, slag film, density current, surface-active component, corrosion rate


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