Oxidation and sulfidation of implanted and unimplanted AISI 446 steel
- Universal Energy Systems, Dayton, OH (USA)
AISI 446 steel exhibited parabolic rate kinetics from the beginning during isothermal oxidation in oxygen at 850C. On the other hand, a pronounced transient oxidation with faster kinetics was observed in Ce- and Xe-implanted AISI 446 steels. The implantation, however, did not affect the steady-state parabolic rate constant, 3.77{plus minus}0.18{times}10{sup {minus}5} mg{sup 2}/cm{sup 4} min. The initial response of implanted steels to oxidation with pronounced transient oxidation was attributed to the physical defects of implantation. The oxide grains formed on AISI 446 early in the process of oxidation were rich in Fe and Cr, and after long exposure the spinel MnCr{sub 2}O{sub 4} became the major constituent of the scale. Ce-implantation did not have any effect on the corrosion behavior of AISI 446 in H{sub 2}/H{sub 2}O/H{sub 2}S/Ar at 850C. The scale had three zones: an outer layer with FeS, (FeCr)S, and spinel oxide; an intermediate layer of (FeCr)S; and an inner layer of Cr-rich oxide and (FeCr)S below the original metal surface.
- OSTI ID:
- 6016796
- Journal Information:
- Oxidation of Metals; (USA), Journal Name: Oxidation of Metals; (USA) Vol. 34:5-6; ISSN 0030-770X; ISSN OXMEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CERIUM IONS
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION RESISTANT ALLOYS
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FERRITIC STEELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
INFORMATION
ION IMPLANTATION
IONS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MATERIALS
MICROSCOPY
NUMERICAL DATA
OXIDATION
REACTION KINETICS
SCALING
SCANNING ELECTRON MICROSCOPY
STAINLESS STEEL-446
STAINLESS STEELS
STEEL-CR25
STEELS
SULFIDATION
VERY HIGH TEMPERATURE
XENON IONS