Oxidation pretreatment to reduce corrosion of 20%Cr-25%Ni-Nb stainless steel. II. Surface morphology and oxide characterization
Improved corrosion behavior of 20%Cr-25%Ni-Nb steel resulting from a low pressure oxidation pretreatment in CO/sub 2/ has been related to changes in elemental composition and distribution in the oxide scale. Auger electron spectroscopy, secondary ion mass spectroscopy, electron microprobe, and X-ray diffraction techniques have been used to investigate the properties of the oxide scale formed on both untreated and pretreated specimens when oxidized at 823 K and 923 K in a CO/sub 2/-1%CO atmosphere. A sputter ion plating technique has been used to separate the oxide from the metal and the incorporation of chromium and silicon at the metal-oxide interface has been investigated at grain centers and grain boundaries by depth profiling. The improvement in oxide adhesion and oxidation rates, using data from Parts I and II of this study, is assessed in terms of oxide formation by solid-state displacement reactions.
- Research Organization:
- Berkeley Nuclear Labs., Gloucestershire (England)
- OSTI ID:
- 6054078
- Journal Information:
- Oxid. Met.; (United States), Vol. 30:3-4
- Country of Publication:
- United States
- Language:
- English
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FUEL CANS
MATERIALS TESTING
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NICKEL-CHROMIUM STEELS
OXIDATION
NIOBIUM ALLOYS
STAINLESS STEELS
ADHESION
AUGER ELECTRON SPECTROSCOPY
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GRAIN BOUNDARIES
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SILICON OXIDES
SURFACE TREATMENTS
X-RAY DIFFRACTION
ALLOYS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
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CHROMIUM COMPOUNDS
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COHERENT SCATTERING
CRYSTAL STRUCTURE
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OXYGEN COMPOUNDS
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