Hot-corrosion behavior of TiAl-base intermetallics in molten salts
- Academia Sinica, Shenyang (China). State Key Lab. for Corrosion and Protection
The hot-corrosion behavior of Ti-50Al, Ti-48Al-2Cr-2Nb, and Ti-50Al,10Cr alloys was investigated in (Na, K){sub 2}SO{sub 4} and Na{sub 2}SO{sub 4}+NaCl melts. TiAl intermetallics showed much better hot-corrosion resistance in (Na, K){sub 2}SO{sub 4} at 900 C than the Ni-base superalloy K38G. Two types of corrosion products formed on Ti-50Al: some areas were covered with continuous Al{sub 2}O{sub 3} scale, whereas other areas formed a mixed Al{sub 2}O{sub 3} + TiO{sub 2} scale; TiS existed at the scale-alloy interface. A mixed Al{sub 2}O{sub 3}+TiO{sub 2} scale formed on Ti-48Al-2Cr-2Nb, and no sulfide was found beneath the scale. An adherent Al{sub 2}O{sub 3} scale, however, formed on Ti-50Al-10Cr, which provided excellent hot-corrosion resistance. All three alloys suffered severe hot corrosion in Na{sub 2}SO{sub 4}+NaCl melts at 850 C. A mixed Al{sub 2}O{sub 3}+TiO{sub 2} scale formed on all three alloys and many voids and pits existed in the scale-alloy interface. The hot-corrosion mechanisms are discussed.
- OSTI ID:
- 351478
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 3-4 Vol. 51; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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