Effect of Rolling Scale on Evolution of Fast-stabilized Rust Layer and Corrosion Resistance of a Weathering Steel
The effect of mill scale on the evolution of the fast-stabilized rust layer and anti-corrosion performance of Q345qDNH weathering steel in industrial atmospheric environment was studied via real atmospheric exposure testing,field emission scanning electron microscope(FE-SEM),field emission electron probe(FE-EPMA),micro-Raman Spectrum and electrochemical technique.The results showed that the presence of Fe3O4,Fe2O3,a small amount of FeO and FeCr2O4 in the oxide scales could improve the compactness of the rust layer,but could not change the types of corrosion products of Q345qDNH weathering steel.The corrosion products of the bare steel and the steel with mill scale were mainly com-posed of γ-FeOOH,α-FeOOH and Fe3O4.In the three types of corrosion products,the propagation of α-FeOOH is an inward growing process.The steels with mill scales present better rust layer stabiliza-tion and corrosion resistance due to the existence of Fe3O4 in the mill scale could promote the forma-tion of α-FeOOH.
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