Corrosion-resistant scales on iron-based alloys

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6343419

Hsu, H S

Corrosion tests were conducted at 800/sup 0/C on iron-based alloys in a H/sub 2/-H/sub 2/S-H/sub 2/O-Ar gas mixture with P/sub S/sub 2// = 10/sup -6/ and P/sub O/sub 2// = 10/sup -20/ atm that simulates severe coal gasification environments. Al/sub 2/O/sub 3/-forming iron-based alloys were more corrosion resistant than Cr/sub 2/O/sub 3/-forming iron-based alloys in this environment. Rapid sulfidation of Al/sub 2/O/sub 3/-forming iron-based alloys with and without preoxidation proceeded initially by nucleation and growth of chromium-rich sulfides and later by formation of iron-rich sulfides. To increase the corrosion resistance of Al/sub 2/O/sub 3/-forming iron-based alloys, the formation of fast-growing sulfides, such as CrS, FeS, and sulfide mixtures containing CrS and/or FeS, should be minimized or avoided completely. A new iron-based alloy developed in this study has shown very good corrosion resistance. Only small metal sulfide particles formed on the alloy surface with no observable internal sulfidation. 6 refs., 14 figs., 3 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6343419
• Report Number(s): CONF-8705103-3; ON: DE87011937
• Country of Publication: United States
• Language: English

Related Subjects

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Lignite
& Peat-- Combustion
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COAL GASIFICATION
COAL GASIFICATION PLANTS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
ELEMENTS
EUTECTICS
GASIFICATION
GRAVIMETRIC ANALYSIS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INCOLOY 800
INCOLOY ALLOYS
INCONEL 600
INCONEL ALLOYS
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTIAL PRESSURE
QUANTITATIVE CHEMICAL ANALYSIS
STAINLESS STEEL-310
STAINLESS STEEL-347
STAINLESS STEELS
STEELS
SULFIDATION
SULFIDES
SULFUR
SULFUR COMPOUNDS
TESTING
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS