合金化溶融亜鉛めっき鋼板のFe-Zn金属間化合物コーティングの破壊・はく落挙動(<特集>合金化溶融亜鉛めっき皮膜の構造と特性)

概要

論文の詳細を見る
Tensile fracture and peeling behavior of the Fe-Zn intermetallic coating of galvannealed steel, together with that of the alumina coating of anodic-oxidized aluminum as a reference were studied. The Fe-Zn coating exhibited first multiple-fracture perpendicular to the tensile axis. Then the coating exhibited compressive fracture in the width-direction, followed by powdering and the mode II-type crack extension in the δ_1 layer and in the δ_1 layer near the δ_1-Γinterface. As a result, the upper ζ+δ_1 and ζ+δ_1+Γ_1 layers were peeled off and the thin δ_1+Γ_1+Γ and Γ_1+Γlayers remained on the steel. Under further applied strain, the remaining δ_1+Γ_1+Γ and Γ_1+Γ layers were fractured in compression in the width-direction, followed by powdering and debonding at the Γ-substrate interface. In such a two times-compressive fracture process, coating layers were peeled off. The alumina coating on the aluminum substrate exhibited multiple-fracture perpendicular to the tensile stress as similarly as the Fe-Zn intermetallic coating. Then, when the coating was thin, the multiply-cracked layer fractured in compression perpendicularly to the tensile axis, accompanied by buckling and wedging, resulting in peeling as similarly as the galvannealed coating.
社団法人日本鉄鋼協会の論文
2005-03-01