Effect of Rolling Process on Corrosion Resistance of SPA-H Container Weathering Steel

Two kinds of SPA-H weathering steel were produced by CSP continuous casting and rolling process and traditional hot rolling process. Their behaviors of corrosion resistance in a simulated marine atmosphere environment, 3.5 wt.% NaCl solution, were investigated by a cyclic dry/wet accelerated experiment and electrochemical impedance spectra (EIS). The morphology of rust scale of steel samples rolled by two processes was observed by SEM. The results show that the SPA-H steel prepared by CSP had the finer and evener microstructure than that prepared by traditional hot rolling process. Under the condition of chloride ions, the former possessed better corrosion resistance than the latter.