Enhancing General Corrosion Resistance of Biomedical High Nitrogen Nickel-Free Stainless Steel by Nitric Acid Passivation

doi:10.1007/s40195-019-00952-w

Abstract

Abstract:

A systematic study of nitric acid passivation was investigated to enhance the general corrosion resistance of biomedical high-nitrogen nickel-free stainless steels (HNSs). After passivation, the corrosion rate of HNS could dramatically reduce to 1/20 of the untreated in 37 °C 0.9 wt% NaCl solutions. Then, the passive film on HNS was analyzed by X-ray photoelectron spectroscopy. It was found that chromium enrichment in the passive film and nitrogen enrichment in the film/metal interface contributed to the improvement in general corrosion resistance of HNS.

Key words: Stainless steel, Nitric acid passivation, General corrosion, Passive film

Yixun Yang, Qingchuan Wang, Jun Li, Lili Tan, Ke Yang. Enhancing General Corrosion Resistance of Biomedical High Nitrogen Nickel-Free Stainless Steel by Nitric Acid Passivation[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 307-312.

Figures/Tables 5

Fig. 1 Effects of temperature a, concentration b and time c of nitric acid passivation on ions releasing concentration of HNS; HNS and 316L stainless steel before and after nitric acid passivation and Ti6Al4V d; the error bars are total error

Fig. 2 Effects of temperature a, concentration b and time c of nitric acid passivation on polarization curves and self-corrosion current of HNS

Fig. 3 Effects of temperature and concentration of nitric acid passivation on the depth profiles of O a, b, Cr c, d, N e, f

Fig. 4 XPS spectra of Cr for passive film after nitric acid passivation at 25 °C a, 50 °C b, 75 °C c, 10 wt% d, 25 wt% e and 40 wt% f

Fig. 5 XPS spectra of N on surface a and matrix b of HNS after nitric acid passivation

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