500℃付近における鉄と溶融亜鉛との反応について

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The reactions between solid iron and liquid zinc at temperatures of so-called "linear range" were studied by dipping the pure iron specimen into the pure molten zinc. At 490℃, the alloy layers consist of a I layer next to the iron, followed by a δ1 layer, a ζ layer and a zinc layer. The ζ layer disappeared at long immersion time, and a (δ1 +η) mixture formed. The growth of each alloy layer seems to be unsystematically, but the total amount of iron reacted with zinc (Fe (total)) and the amount of iron diffused into the alloy layers (Fe (in alloy layer)) varied with immersion time according to the parabolic rate law. At 500℃ and 510℃, the alloy layers consist of a I layer next to the iron, followed by a δ1 layer, a (δ1+η) layer and a zinc layer. The ζ phase didn't form even at short immersion time. The total thickness of the alloy layers and the thickness of the (δ1+η)layer varied with immersion time according to the rate law faster than the parabolic rate law. Therefore, it seems that the (δ1+η) layer grows not only by diffusion mechanism, but also by zinc penetration. The Fe (total) and Fe (in alloy layer) varied with immersion time according to the linear rate law roughly, but the latter became constant as the (δ1+η) layer dropped off into the molten zinc. The amount of iron dissolved into the molten zinc (Fe (in molten zinc)) is proportional to (immersion time)O.8 for every immersion temperatures. It is remarkable that the variation of Fe (in molten zinc) for 490℃ is similar to that for "linear range".
長崎大学工学部の論文

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古賀秀人
長崎大工

500℃付近における鉄と溶融亜鉛との反応について

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