Journal
NPJ MATERIALS DEGRADATION
Volume 7, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41529-023-00394-x
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The effect of nitrogen content on the composition, structure and protectiveness of passive films formed on high-nitrogen austenitic stainless steels (HNSS) in a NaCl solution was studied using electrochemical tests combined with SEM, EBSD and XPS. The results showed that higher nitrogen content led to a larger proportion of low-angle grain boundaries, lower corrosion current density and higher corrosion resistance due to the presence of stable oxides.
A series of electrochemical tests combined with the techniques of scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and X-ray photoelectron spectroscopy (XPS) were used to study the effect of nitrogen content on the composition, structure and protectiveness of passive films, which were formed on the surfaces of high-nitrogen austenitic stainless steels (HNSS) in 0.5 mol/L NaCl solution. The results showed that the HNSS with higher nitrogen content had a larger proportion of low-angle grain boundaries, and it also had a lower corrosion current density in 0.5 mol/L NaCl solution and thus a lower corrosion rate. The existence of a larger proportion of stable oxides (e.g., Cr2O3) in the passive films facilitates the passivation/repassivation process and contributes to the high corrosion resistance of HNSS.
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