Low temperature (650 to 700/sup 0/C) burner rig testing

Journal Article · Mon Nov 01 04:00:00 EST 1982 · J. Test. Eval.; (United States)

OSTI ID:5992288

Aprigliano, L F

A low temperature (677/sup 0/C (1250/sup 0/F)) 500-h burner rig test using a fuel with 2% by weight of sulfur was made of IN939, a standard cobalt, chromium, aluminum, yttrium (CoCrAlY) coating, and a nickel, chromium, aluminum, yttrium (NiCrAlY) coating. Both the IN939 and the CoCrAlY coating were found to hot-corrode readily. The CoCrAlY coating hot-corroded by a Type 2 mechanism (low-melting point mixed sulfate), while the IN939 showed evidence of both Type 1 (sulfidation) and Type 2 hot corrosion. The NiCrAlY coating was relatively unattacked. A change in the mode of attack was noted in the CoCrAlY coating when the rig temperature dropped to 650/sup 0/C(1200/sup 0/F) for 24 h. The corrosion mode may have changed from one in which solid cobaltous oxide is the stable phase at the gas/scale interface to one in which solid cobalt sulfate is the stable phase.

• Research Organization: U.S. Navy, David Taylor R and D Center, Code 2812, Annapolis, MD 21402
• OSTI ID: 5992288
• Journal Information: J. Test. Eval.; (United States), Journal Name: J. Test. Eval.; (United States) Vol. 10:6; ISSN JTEVA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
ALLOY SYSTEMS
ALLOY-IN-939
ALLOYS
ALUMINIUM ALLOYS
BORON ADDITIONS
BORON ALLOYS
BURNERS
CARBON ADDITIONS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COATINGS
COBALT ALLOYS
COBALT COMPOUNDS
COBALT OXIDES
COBALT SULFATES
COMBUSTION PRODUCTS
CORROSION
CORROSION PRODUCTS
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
FUELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
NONDESTRUCTIVE TESTING
OXIDES
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
QUATERNARY ALLOY SYSTEMS
SCALING
SULFATES
SULFUR COMPOUNDS
SULFUR CONTENT
TANTALUM ALLOYS
TESTING
THERMAL TESTING
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN ALLOYS
YTTRIUM ALLOYS
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS