Observation of passive films on Fe–20Cr–xNi (x=0, 10, 20wt.%) alloys using TEM and Cs-corrected STEM–EELS

The influence of nanocrystalline structure and processing route on corrosion of stainless steel: A review

“…Ni is reported to impart a moderate improvement in the pitting resistance [90,162]. Addition of small amounts of Mo [163][164][165][166][167], N [168][169][170], W [171], V [171], and Cu [119,172] are reported to impart significant improvement in pitting resistance of SS.…”

A comparative review of the aqueous corrosion of glasses, crystalline ceramics, and metals

“…4-6. Figure 4 shows a TEM cross section of the passive film formed on Fe-20Cr-10Ni in deaerated, 50°C, pH 8.5 borate buffer solution at 0.4 VSCE for 12 h. 195 The film is seen to be about 2.5 nm thick. Fast Fourier transform images indicate that the passive film is amorphous.…”

A Study on the localized corrosion and repassivation kinetics of Fe-20Cr- x Ni ( x = 0–20 wt%) stainless steels via electrochemical analysis

“…Moreover, Jang et al also reported that the donor density in the passive film of Fe-20Cr-10Ni alloy was higher than that of Fe-20Cr alloy though Mott-Schottky analyses [72]. For the composition and the structure of the passive film of Fe-20Cr-xNi (x=0, 10 and 20 wt%) alloys, it was observed in the previous study through Cs-corrected scanning transmission electron microscope-electron energy loss spectroscopy (STEM-EELS) [73]. wt% Cr and 8 wt% Ni [77].…”

“…For example, metastable pitting can be generated in Cl -containing solution during the passivation as shown in Figure 2 in this study, and it might affect the passive film property. Hence, in this study, we used pH 8.5 borate buffer solution instead of 1 M MgCl 2 solution in order to prevent the unexpected damages for the passive film to form a stable passive film [73]. Moreover, according to Ha and Kwon [74], the thickness of the passive film reached a maximum at pH 8.5∼9 in various pH 7∼11 borate buffer solutions; they also found that films formed at pH 8.5∼9 were the most protective and exhibited the lowest defect density.…”