A diffusion controlling duplex-layer oxidation model with scale removal in oxygen containing liquid metal flow

Scale removal effect makes the high temperature oxidation in liquid metal flow environments very complicated, together with the selective corrosion and/or oxidation caused by the alloy components and metallurgical impurities. A diffusion controlling duplex-layer oxidation model, considering scale removal, has been developed in an oxygen-containing liquid metal environment. The volume change caused by the Pilling–Bedworth ratio, the redistribution of the noble components and impurities is coupled with the weight gain during oxidation. The derived governing equations, after coordinate transform, are analogized with the Stefan problem and solved by the finite difference method. Extension schemes for multiple layer structure are analyzed. The developed model is benchmarked with previous results and experimental data, and good agreement is obtained.