電気亜鉛めつき鋼板の加熱による合金化挙動

概要

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Alloying behavior of electrogalvanized coatings on a steel sheet was studied mainly by the method of X-ray diffraction at temperatures especially from 240 to 340℃. At the temperatures below 300℃, a cubic intermetallic phase like Γ is observed besides ζ phase from the beginning of the reaction. This Γ-like phase is electrochemically similar to ζ phase, and its {111} planes are predominantly oriented parallel to the original steel/zinc interface. Then another cubic phase is formed between steel and Γ-like phase after latent time more than a couple of hours. This secondary cubic phase is nobler than the first one. Within a range of 320 to 340℃, Γ-like phase preferentially oriented is formed and grown up. Then this phase is transformed into δ_1 phase. At temperatures above 380℃, Γ-like phase preferentially oriented is not observed, and cubic phases are not formed at the beginning of the reaction, and ζ and δ_1 phases are grown up since the beginning of the reaction. At these temperatures, cubic intermetallic phases, which are formed late, are not preferentially oriented.
社団法人日本鉄鋼協会の論文
1986-07-01