Elevated temperature corrosion behavior of iron-base ternary alloys that develop Cr/sub 2/O/sub 3/ and/or Al/sub 2/O/sub 3/ barrier scales

Conference · Mon May 01 04:00:00 EDT 1978

OSTI ID:6762188

Nagarajan, V; Levy, A V

The elevated temperature corrosion behavior of iron-base ternary alloys that develop Cr/sub 2/O/sub 3/ and/or Al/sub 2/O/sub 3/ barrier scales was investigated by exposing them to a mixed gas environment at 982/sup 0/C whose PO/sub 2/ was approximately 10/sup -18/ atm and whose PS/sub 2/ was approximately 10/sup -6/ atm. The alloys containing 18% Cr and 2.5 to 5% Al had the best corrosion resistance of the alloys tested. They developed a duplex Cr/sub 2/O/sub 3//Al/sub 2/O/sub 3/ scale through which sulfur did not readily diffuse. The 18% Cr alloy containing only 1% Al formed a Cr/sub 2/O/sub 3/ scale and had poor corrosion resistance because of rapid sulfur diffusion through the scale. Alloys that contained 10% Al and 0 to 15% Cr did not have good corrosion resistance because of sulfur diffusion through the single Al/sub 2/O/sub 3/ scale which formed. Alloys with 18% Cr that contained Si as a ternary addition did not develop continuous SiO/sub 2/ layers beneath the Cr/sub 2/O/sub 3/ outer scale and exhibited poor corrosion resistance.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6762188
• Report Number(s): LBL-7331; CONF-780571-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHROMIUM ALLOYS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COATINGS
CORROSION RESISTANCE
IRON ALLOYS
IRON BASE ALLOYS
OXIDES
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
TERNARY ALLOY SYSTEMS
TRANSITION ELEMENT COMPOUNDS