合金化溶融亜鉛めつき鋼板の合金層形態と剥離の関係(溶融めつき)(<特集>表面処理)

概要

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The structure of the galvannealed coating was studied by etching and measuring the potential time curve for the electro-chemical stripping. The formation of Γ phase was found to have the following extreme cases : (1) Γ layer is formed along the Zn/Fe boundary, which was typically shown in 1.6% Mn steel. (2) Γ grains are scattered in the δ_1(c) layer near the Zn/Fe boundary ((δ_1+Γ) layer), which is typically shown in P-Nb bearing steel. The behavior of cracks in the coating was observed after bending. The cracks were generated from the Γ layer or (δ_1+Γ) layer. The cracks propagated most easily in the Γ layer, followed by the (δ_1+Γ) layer. The length of crack propagating along the Zn/Fe boundary was mainly dependent upon the thickness of the Γ layer. Therefore, the form of Γ phase was found to affect the powdering behavior.
社団法人日本鉄鋼協会の論文
1986-06-01