Anti-corrosion Mechanism of Rust Layers with Atmospheric Corrosion Resistance

During the initial corrosion period,the growing rule and anli-corrosion mechanism of rust layers with atmospheric corrosion resistance had been studied for a weathering steel and a carbon steel,using an accelerate industrial atmospheric corrosion test of dry-wet cyclic immersion.SEM and XRD were used to measure the rust layer structure.The results showed that;during the initial corrosion period,the composition of rust layers of the weathering steel was mainly α-FeOOH and that of the carbon steel was mainly Fe2O3.The dentrite of α-FeOOH is fine and the rust layers are compact and protective.The dentrite of Fe2O3 is big and the rust layers are loose,porous and non-protedive.