| Title |
Effects of Silicon on Galvanizing Coating Characteristics in Dual Phase High Strength Steel |
| Authors |
전선호(Sun Ho Jeon); 진광근(Kwang Geun Chin); 신광수(Kwang Soo Shin); 이준호(Joon Ho Lee); 손호상(Ho Sang Sohn) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
galvanizing steel; GI; coatability; wettability; inhibition Layer; selective oxidation; dual phase high strength steel |
| 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 Mn2SiO4, 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. |