合金化溶融亜鉛めっき鋼板のパウダリング特性に及ぼすめっきならびに合金化条件の影響(溶融めっき)(<特集>表面処理)

概要

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The effects of various manufacturing conditions on powdering characteristics were investigated. Powdering is suppressed by an increase in Al content of the bath, a decrease in the bath temperature and a decrease in the galvannealing temperature. All of these conditions tend to delay the alloying progress. In the case of low Al content (0.12%), ζ-phase (FeZn_<13>) abruptly, appears and forms homogeneous layer at the initial stage of alloying, and then completely changes into δ_1-phase (FeZn_7) in a short period. When the Al content is high (0.16%), the alloying progress is slow and ζ-phase appears heterogeneously at localized spots with time lags. The ζ-phase which appeared late remains unchanged up to the δ_1-phase. As the hardness of ζ-phase is lower than that of δ_1-phase, the ζ-phase deforms preferentially and relaxes a part of stress induced by forming, therefore powdering is suppressed.
社団法人日本鉄鋼協会の論文
1991-07-01