|
Vol.47, No.7, 423 ~ 433, 2009
|
| Title |
| Effects of Silicon on Galvanizing Coating Characteristics in Dual Phase High Strength Steel |
| 전선호 Sun Ho Jeon , 진광근 Kwang Geun Chin , 신광수 Kwang Soo Shin , 이준호 Joon Ho Lee , 손호상 Ho Sang Sohn |
|
|
|
| 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. |
|
|
| Key Words |
| galvanizing steel, GI, coatability, wettability, inhibition Layer, selective oxidation, dual phase high strength steel |
|
|
 |
|
