合金化溶融亜鉛めっき鋼板の皮膜/基板界面密着強度と皮膜/基板界面構造に及ぼす溶融 Zn 中 Al の効果

概要

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We investigated on shear adhesion strength of galvannealed steel (GA), focusing on interface structure. Galvanizing was performed at the several dipping conditions which was varied in the range between 0.05 and 0.18 mass% aluminium in molten zinc bath. The interface structure was evaluated employing scanning electron microscopy (SEM) and electron channeling pattern (ECP). High aluminium added to molten zinc raised the minimum interface adhesion strength of the coating around 9 mass % iron. Moreover, ruggedness with pitch of α-Fe grain size was remarkably formed at coating/substrate interface, only when the substrate sheets were galvanized in high aluminium-containing zinc-bath. The ruggedness formation seems to be caused by the difference of Г phase growth rate between on (111)-(113)-(313) α and on the plane of [010]α zone. Г phase grew slower on (111)-(113)-(313)α compared to on the plane of [010]α zone. The dependence of Г phase growth behavior on iron orientation was promoted by aluminium addition to molten zinc bath. From above mentioned results, the model that GA coating/substrate interface adhesion strength was varied with geometrical shape of the interface, which was reported previously, can be expanded to explain not only effect of iron in coating but one of aluminium in molten zinc.
社団法人日本鉄鋼協会の論文
1994-08-01