Journal
SURFACE & COATINGS TECHNOLOGY
Volume 206, Issue 16, Pages 3428-3436Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.02.001
Keywords
Dual phase steel; Hot-dip galvanizing; Selective oxidation; Mechanical property degradation
Funding
- Chinese Scholarship Council (CSC) at MPIE
- Postgraduate Innovation Foundation in Shanghai University [SHUCX101049]
- 973-Project [2010CB630802]
- NSFC [50934011, 50971137]
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In this work, the two challenges in hot-dip galvanizing of high strength dual phase steel such as surface selective oxidation and mechanical property degradation were discussed. It was shown that the external selective oxidation occurred at low dew point -30 degrees C caused the full coverage of oxides, which is a problem for reactive wetting by molten zinc. Although increase of dew point to +10 degrees C decreased the surface coverage of oxides, the formation of internal oxides consumed the alloying element and accumulated in the subsurface area in a large scale. Furthermore, the heat treatment parameters of hot-dip galvanizing, i.e. cooling rate after inter-critical annealing and the 460 degrees C-isothermal soaking time influenced the mechanical properties. (C) 2012 Elsevier B.V. All rights reserved.
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