Oxide Film Properties on an Interstitial-Free Manganese alloyed Steel in Sodium Sulphate Solution

摘要

Components of oxide films on interstitial-free (IF) manganese alloyed steel significantly affectcorrosion resistance, and the formation of oxide films and their properties are closely related to theenrichment of alloying elements and the structure of IF manganese alloyed steel. The components andelectrochemical properties of oxide films formed on IF manganese alloyed steel were measured by Xray photoelectron spectroscopy (XPS) and electrochemical tests using 1×10-5 mol/L Na2SO4 solution asan electrolyte for different annealed samples with Mn content (wt%) from 0.079 to 0.556. The resultsshowed that the corrosion resistance of oxide films generated on IF manganese alloyed steel decreaseswith Mn enrichment. According to analysis by X-ray diffraction (XRD) and electron backscatterdiffraction (EBSD), with augmented Mn content, the crystal-oriented distribution of samples becomesobviously concentrated, and the volume fraction of {111}//ND texture increases. It is confirmed thesignificant role of the Mn content on grain refinement of IF manganese alloyed steel. In addition, theoxides of other elements (Si and Fe) tend to hold steady with increasing Mn content.