Effects of silicon on galvanizing coating characteristics in dual phase high strength steel

Sun Ho Jeon, Kwang Geun Chin, Kwang Soo Shin, Joon Ho Lee, Ho Sang Sohn

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In the galvanizing coating process, the effects of the silicon content on the coatability and wettability of molten zinc were investigated on Dual-Phase High Strength Steels (DP-HSS) with various Si contents using the galvanizing simulator and dynamic reactive wetting systems. DP-HSS showed good coatability and a well-developed inhibition layer in the range of Si content below 0.5 wt%. Good coatability was the results of the mixed oxide Mn2SiO 4, being formed by the selective oxidation on the surface, with a low contact angle in molten zinc and a large fraction of oxide free surface that provided a sufficient site for the molten zinc to wet and react with the substrate. On the other hand, with more than 0.5 wt%, DP-HSS exhibited poor coatability and an irregularly developed inhibition layer. The poor coatability was due to the poor wettability that resulted from the development of network-type layers of amorphous SiO2, leading to a high contact angle in molten zinc, on the surface.

Original languageEnglish
Pages (from-to)523-532
Number of pages10
JournalJournal of Korean Institute of Metals and Materials
Volume47
Issue number7
Publication statusPublished - 2009

Keywords

  • Coatability
  • Dual phase high strength steel
  • Galvanizing steel (gi)
  • Inhibition layer
  • Selective oxidation
  • Wettability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Modelling and Simulation
  • Surfaces, Coatings and Films
  • Metals and Alloys

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