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The role of silicon in the hot dip galvanizing process.

Authors :
Sepper, Sirli
Peetsalu, Priidu
Kulu, Priit
Saarna, Mart
Mikli, Valdek
Source :
Proceedings of the Estonian Academy of Sciences. 2016, Vol. 65 Issue 2, p159-165. 7p.
Publication Year :
2016

Abstract

The study focuses on the role of silicon in the hot dip galvanizing process. Coating formation and growth were analysed. Centrifugal casting was used to prepare steel substrates with different silicon concentrations (< 0.01%, 0.06%, 0.11%, 0.17%, and 0.30%). Hot dip galvanizing was performed at 450 °C in the industrial galvanizing plant Zincpot (Estonia). The galvanizing time for coating formation was 4-25 s and for coating growth 195 and 1200 s after a longer incubation time. The thickness of the coating was measured and the microstructure of the Zn-Fe coating was examined. Even a very short time contact (4 s) between steel and zinc led to the formation of Fe-Zn intermetallics. The first phase was the ζ phase, immediately followed by the δ and then, after incubation the Γ phase. The reactions that took place in the galvanizing process during the shorter dipping times (< 25 s) were not influenced by silicon concentrations, but the influence of silicon was remarkable after longer dipping times (> 25 s). A schematic model of zinc coating formation is presented. Silicon affects hot dip galvanizing reactions by influencing Zn diffusion into steel and Fe diffusion into the coating. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
17366046
Volume :
65
Issue :
2
Database :
Academic Search Index
Journal :
Proceedings of the Estonian Academy of Sciences
Publication Type :
Academic Journal
Accession number :
115161960
Full Text :
https://doi.org/10.3176/proc.2016.2.11