Abstract
Hot rolled galvanised steel via hydrogen reduction in oxidation scale, instead of acid pickling, has been studied. X-ray diffraction and SEM results show that scale reduction could be almost completed at 900°C for 4 min in a mixing atmosphere of 50%H2–50%N2. The reduction kinetics was estimated by measuring scale thickness, indicating that the scale reduction process might be a diffusion controlled reaction. Bending tests demonstrate that hot rolled galvanised steel at 600°C exhibits superior coating adherence compared to conventional coating.
This work was financially supported by the National Twelfth Five-year Science and Technology Support Program no. 2011BAE13B01.