鉄と溶融亜鉛との反応について

抄録

To study the interdiffusion between solid iron and liquid zinc, high purity iron test pieces were dipped into high purity zinc baths of 440∼600°C. The thickness and the growth rate of alloy layers on the iron surface, and the quantity of iron reacted with zinc (iron weight loss, Fe (total), iron remained in the alloy layers, Fe (alloy), and iron dissolved into the zinc baths, Fe (zinc)) were measured.
A Γ layer was formed next to the iron, followed by a δ_1K layer. Up to 490°C, a δ_1P layer and a ζ layer were formed next to the δ_1K layer. The ζ layer decreased with immersion time, and disappeared at 490°C. The growth rate of the δ₁ layer was higher than that of the ζ layer. Over the temperature range between 500 and 560°C, a (δ₁+η) mixture layer was formed next to the δ₁ layer, and dropped off into the bath. Above 560°C, the δ_1K layer formed on the surface of the alloy layers dropped off into the bath. Its thickness remained constant (about 10 μm). The total thickness of the alloy layers had a peak at about 520°C.
Fe (total) corresponded to the sum of Fe (alloy) and Fe (zinc), and had a peak at 520°C for a short immersion time (t≤20 min), at 500°C for a long immersion time (t≥50 min); the values of Fe (total) were higher than those in other experiments above 540°C. Fe (alloy) had a peak at about 520°C, corresponding to the thickness of the alloy layers; its peak values remained constant (t≥20 min). Fe (zinc) had a peak at 500°C for a long immersion time (t≥50 min).