Interpretation on Sebisty effect of hot-dip galvanized steels

Sebisty effect describes the unusual fact that the thickness of the hot-dip galvanizing coating on the steel containing 0.12%-0.25% silicon decreases with increasing temperature of zinc bath. The microstructures of hot-dip galvanized coatings on silicon-containing steels (0.14%Si) immersed in zinc b...

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Veröffentlicht in:Transactions of Nonferrous Metals Society of China 2005-12, Vol.15 (6), p.1275-1279
Hauptverfasser: Che, Chun-Shan, Lu, Jin-Tang, Kong, Gang
Format: Artikel
Sprache:eng
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Zusammenfassung:Sebisty effect describes the unusual fact that the thickness of the hot-dip galvanizing coating on the steel containing 0.12%-0.25% silicon decreases with increasing temperature of zinc bath. The microstructures of hot-dip galvanized coatings on silicon-containing steels (0.14%Si) immersed in zinc bath at 723 K and 753 K were analyzed. It is found that the thickness of eta and xi layer decreases with the increase of temperature of zinc bath and Gamma layer changes from discontinuous layer (at 723 K) to relatively continuous layer (at 753 K). The improvement of the fluidity of zinc bath due to the rising temperature of zinc bath makes eta layer thinner. Moreover, the existence of relatively continuous Gamma layer and the acceleration of the dissolution of xi layer to zinc bath co-lead to the decrease of the thickness of xi layer with increasing temperature.
ISSN:1003-6326