Oxidation pretreatment to reduce corrosion of 20%Cr-25%Ni-Nb stainless steel. I. Weight gain and oxide thickness measurements
The improvement in corrosion resistance afforded by a low-pressure selective oxidation pretreatment on 20%Cr-25%Ni-Nb steel is assessed in terms of weight gain and oxide thickness measurements. Both can and sheet specimens were oxidized in a simulated CAGR CO/sub 2/ environment at 823, 923, and 1073 K, and gravimetric gross weight-gain measurements were supplemented by spinel and Cr/sub 2/O/sub 3/ oxide thickness measurements determined by X-ray diffractometry (XRD). The increased protection provided by the pretreatment resulted in a reduction in gross weigh gain of 3-4 times at 823 K, two and three times at 923 K, and a somewhat smaller improvement at higher temperatures. The improvement stemmed from the high proportion of Cr/sub 2/O/sub 3/ selectively formed in the preoxide layer itself. Thermally induced lattice strains in the oxide scale have been assessed from measurements of lattice expansion by XRD.
- Research Organization:
- Berkeley Nuclear Labs., Gloucestershire (England)
- OSTI ID:
- 5930987
- Journal Information:
- Oxid. Met.; (United States), Vol. 30:3-4
- Country of Publication:
- United States
- Language:
- English
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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
CHROMIUM OXIDES
X-RAY DIFFRACTION
FUEL CANS
MATERIALS TESTING
GAS COOLED REACTORS
REACTOR MATERIALS
NICKEL-CHROMIUM STEELS
OXIDATION
NIOBIUM ALLOYS
STAINLESS STEELS
CARBON DIOXIDE
CORROSION RESISTANCE
LATTICE PARAMETERS
PROTECTIVE COATINGS
SCALING
SURFACE TREATMENTS
TEMPERATURE EFFECTS
THERMAL CYCLING
THERMAL EXPANSION
THICKNESS
WEIGHT MEASUREMENT
ALLOYS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
COATINGS
COHERENT SCATTERING
DIFFRACTION
DIMENSIONS
EXPANSION
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
NICKEL ALLOYS
NICKEL STEELS
OXIDES
OXYGEN COMPOUNDS
REACTORS
SCATTERING
STEELS
TESTING
TRANSITION ELEMENT COMPOUNDS
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