Breakaway corrosion in mixed-gas environments
Conference
·
OSTI ID:5752270
Incoloy 800 was preoxidized for approx. 165 h in a low-oxygen environment (p/sub O/sub 2// = 9 x 10/sup -18/ atm) at 875/sup 0/C. subsequently, the specimens were exposed for approx. 165 h to either H/sub 2/-H/sub 2/S or CO-CO/sub 2/-CH/sub 4/-H/sub 2/-H/sub 2/S gas mixtures with a wide range of oxygen and sulfur partial pressures. Results show that in atmospheres with p/Sub S/sub 2// values below that required for base-metal sulfidation and above-threshold p/sub O/sub 2// values, negligible adsorption of sulfur by the Cr-rich oxide scale is noted. Any transport of sulfur across the oxide scale leads to the formation of Cr sulfide particles at grain-boundary locations. Under these conditions, the alloy can weaken owing to grain-boundary embrittlement but the sulfidation wastage will be small. The same conclusions can apply even if the atmosphere has a p/sub S/sub 2// value above that required for base-metal sulfidation and an above-threshold p/sub O/sub 2// value. As p/sub O/sub 2// decreases below the threshold value, significant adsorption of sulfur by the scale and establishment of sulfur channels occur; these processes aid in the transport of Fe and Ni to the gas/scale interface for reaction to form fast-growing sulfides, which lead to breakaway corrosion.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5752270
- Report Number(s):
- CONF-831086-2; ON: DE83014704
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-temperature corrosion and mechanical properties of protective scales on incoloy 800H: The influence of preoxidation and ion implantation
Preoxidation for the protection of high-temperature alloys in environments of high sulfur and low oxygen potentials pertinent to gasification processes
Corrosion behavior of Cr/sub 2/O/sub 3/--former alloys in H/sub 2/-H/sub 2/S-H/sub 2/O atmospheres
Journal Article
·
Wed Jan 31 23:00:00 EST 1990
· Oxidation of Metals; (USA)
·
OSTI ID:6537004
Preoxidation for the protection of high-temperature alloys in environments of high sulfur and low oxygen potentials pertinent to gasification processes
Conference
·
· TMS (The Metallurgical Society) Paper Selection; (USA)
·
OSTI ID:5465615
Corrosion behavior of Cr/sub 2/O/sub 3/--former alloys in H/sub 2/-H/sub 2/S-H/sub 2/O atmospheres
Journal Article
·
Thu Dec 31 23:00:00 EST 1981
· Corrosion (Houston); (United States)
·
OSTI ID:5946139
Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKANES
ALLOYS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION
DISPERSIONS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METHANE
MIXTURES
NICKEL ALLOYS
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
VERY HIGH TEMPERATURE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKANES
ALLOYS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION
DISPERSIONS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METHANE
MIXTURES
NICKEL ALLOYS
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
SULFIDATION
SULFIDES
SULFUR COMPOUNDS
VERY HIGH TEMPERATURE