High temperature corrosion behavior of Ni{sub 3}Al-based alloys

Book · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:72504

Li, H; Guo, J T; Lai, W H; Wang, S H; Tan, M H ^[1]

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1. Chinese Academy of Sciences, Shenyang (China). Inst. of Metal Research

The corrosion behavior of a Ni{sub 3}Al-15at%Fe alloy has been studied in air and melted salts, and also that of Ni{sub 3}Al alloys contained series boron in melted salts. The first alloy has two oxidation rate constants. Its initial oxidation activity energy is 319 kJ/mol. There was much FeAl{sub 2}O{sub 4} formed at 950 C, which possessed better oxidation resistance than NiFe{sub 2}O{sub 4}, therefore the alloy had the best oxidation resistance at 950 C. It also had better sulfidation resistance than 00Cr19Ni11Ti stainless steel at 850 C , but the alloy was sulfidized seriously at 950 C. The sulfides were FeS{sub 2} at 950 C. There were different initial oxides formed, which were Fe{sub 3}O{sub 4} at 850 C, and mixture oxides of NiO,NiMoO{sub 4}, Al{sub 2}O{sub 3} and NiAl{sub 2}O{sub 4} at 950 C, respectively. The Ni{sub 3}Al alloys with boron contents from 0 to 3.7at% had better sulfidation resistance than the stainless steel at 850 C, and the alloy with 1.37at%B was the best. The sulfides were the same in the boron containing Ni{sub 3}Al alloys which were Al{sub 2}S{sub 3} and Ni{sub 7}S{sub 6}.

• OSTI ID: 72504
• Report Number(s): CONF-941144--; ISBN 1-55899-265-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
ALUMINIUM SULFIDES
BORON
BORON ADDITIONS
CORROSION PRODUCTS
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON OXIDES
IRON SULFIDES
METALLURGICAL EFFECTS
MOLYBDENUM OXIDES
NICKEL BASE ALLOYS
NICKEL OXIDES
OXIDATION
SULFIDATION