鉄鋼の溶融亜鉛メッキにおける金属間化合物相の形成と成長について

概要

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Iron specimens have been immersed in molten zinc containing no aluminum at temperatures of 430 and 460℃. Intermediate phases appear in the order of ζ(FeZn_<13>), palisade δ_1(FeZn_7), Γ(Fe_3Zn_<10>), Γ_1-(Fe_5Zn_<21>) and compact δ_1(FeZn_7) phases. This order agrees completely with that observed in the reaction of iron with solid zinc. The reciprocal of the appearance time of each phase has an Arrhenius type of temperature dependence in the temperature range from 240 to 460℃. When new phase appears, the growth rates of the phases which have existed prior to the appearance of the new phase vary complicatedly. A side from these variations, the palisade δ_1 phase layer grows rapidly twice after the formation of Γ phase and the following formation of compact δ_1 phase. It appears that the growth of all phases could not be represented by a simple exponential function. EPMA line analysis reveals that the concentration gap between compact δ_1 layer and palisade δ_1 layer becomes gradually obscure with the increase in width of total δ_1 phase layer. It seems that the concentration gap between both δ_1 layers is merely the steep concentration gradient derived from the concentration dependence of interdiffusion coefficient in δ_1 phase.
社団法人日本鉄鋼協会の論文
1978-12-01