Localized corrosion of a high nitrogen stainless steel: N-Mo synergism
- Dept. of Energy, Albany, OR (United States). Albany Research Center
A series of twelve austenitic stainless steels with a composition range of Fe-22Cr-5Ni-5Mn-(1-5)Mo-(0-0.7)N were studied for resistance to localized corrosion in a deaerated 3.5 wt.% NaCl solution. Test temperatures ranged from 30 to 97 C. Results are compared to those of 304 and 316L stainless steel. The potentiodynamic polarization technique was used to determine the critical pit nucleation and protection potentials, and the potentiostatic cyclic thermometry technique was used to determine the critical pitting temperature. Results using the potentiodynamic polarization technique have shown that all of the stainless steels containing both nitrogen and molybdenum have pit nucleation potentials significantly higher than either 304 and 316 stainless steels. The nitrogen-molybdenum synergism is demonstrated by the fact that as little as 0.47 wt% N has a large effect on increasing the pit nucleation potential when molybdenum is present. Results using the potentiostatic cyclic thermometry technique have shown that the critical pitting potential is a linear function of the pitting resistance equivalent (PRE) and strongly dependent on both Mo and N concentration in the alloy.
- Research Organization:
- ARC (Albany Research Center (ARC), Albany, OR)
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 549886
- Report Number(s):
- DOE/ARC-1997-012; CONF-970332--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CORROSION RESISTANCE
CORROSIVE EFFECTS
EXPERIMENTAL DATA
METALLURGICAL EFFECTS
MOLYBDENUM
NITROGEN ADDITIONS
PITTING CORROSION
SODIUM CHLORIDES
STAINLESS STEEL-304
STAINLESS STEEL-316L
STAINLESS STEELS
SYNERGISM
critical pitting temperature
cyclic thermometry
high nitrogen stainless steel
localized corrosion
molybdenum
pitting potential
potentiodynamic
potentiostatic
sodium chloride
stainless steel