Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of Silicon on Galvanizing Coating Characteristics in Dual Phase High Strength Steel

복합조직형 고강도 용융아연 도금강판의 도금특성에 미치는 강중 Si의 영향

  • Jeon, Sun-Ho (POSCO Technical Research Laboratories) ;
  • Chin, Kwang-Geun (POSCO Technical Research Laboratories) ;
  • Shin, Kwang-Soo (Research Institute of Industrial Science & Technology(RIST)) ;
  • Lee, Joon-Ho (Materials Science & Engineering, Korea University) ;
  • Sohn, Ho-Sang (Materials Science & Metallurgical Engineering, Kyungpook National University)
  • Received : 2009.04.14
  • Published : 2009.07.25
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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 $Mn_{2}SiO_{4}$, 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 ${SiO}_{2}$, leading to a high contact angle in molten zinc, on the surface.

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