Effect of nitrogen content on corrosion behavior of high-nitrogen austenitic stainless steel

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...

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Veröffentlicht in:Npj Materials degradation 2023-09, Vol.7 (1), p.75-14, Article 75
Hauptverfasser: Gao, Fengyin, Qiao, Yanxin, Chen, Jian, Yang, Lanlan, Zhou, Huiling, Zheng, Zhibin, Zhang, Lianmin
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Sprache:eng
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Zusammenfassung: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., Cr 2 O 3 ) in the passive films facilitates the passivation/repassivation process and contributes to the high corrosion resistance of HNSS.
ISSN:2397-2106
2397-2106
DOI:10.1038/s41529-023-00394-x