Molybdenum Effects on Pitting Corrosion Resistance of FeCrMnMoNC Austenitic Stainless Steels
- Molybdenum Effects on Pitting Corrosion Resistance of FeCrMnMoNC Austenitic Stainless Steels
- 천동원; 배지환; Heon-Young Ha; Tae-Ho Lee
- high interstitial alloy; molybdenum; pitting corrosion; passive film
- Issue Date
- VOL 8, NO 8, 653
- For Fe-based 18Cr10Mn0.4N0.5C(0– 2.17)Mo (in wt %) austenitic stainless steels, effects of
Mo on pitting corrosion resistance and the improvement mechanism were investigated. Alloying Mo increased pitting and repassivation potentials and enhanced the passive film resistance by decreasing number of point defects in the film. In addition, Mo reduced critical dissolution rate of the alloys in acidified chloride solutions, and the alloy with higher Mo content could remain in the passive state in stronger acid. Thus, it was concluded that the alloying Mo enhanced pitting corrosion resistance of the alloys through increasing protectiveness of passive film and lowering pit growth rate
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