Corrosion of Ni-Ti alloys in the molten (Li,K)(2)CO3 eutectic mixture

Authors
Citation
Cl. Zeng et Wt. Wu, Corrosion of Ni-Ti alloys in the molten (Li,K)(2)CO3 eutectic mixture, CORROS SCI, 44(1), 2002, pp. 1-12
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
CORROSION SCIENCE
ISSN journal
0010-938X → ACNP
Volume
44
Issue
1
Year of publication
2002
Pages
1 - 12
Database
ISI
SICI code
0010-938X(200201)44:1<1:CONAIT>2.0.ZU;2-2
Abstract
The corrosion of pure Ni and of binary Ni-Ti alloys containing 5, 10, and 1 5 wt.% Ti respectively in molten (0.62Li,0.38K)(2)CO3 at 650 degreesC under air has been studied. The corrosion of the single-phase Ni-5Ti alloy was s lower than that of pure Ni, forming an external scale composed of NiO and T iO2. The two-phase Ni-10Ti and Ni-15Ti alloys underwent much faster corrosi on than pure Ni, producing an external scale containing NiO and TiO2, and a thick internal oxidation zone of titanium mainly involving the intermetall ic compound TiNi3 in the original alloys. The rates of growth of the extern al scales for the Ni-Ti alloys were reduced with the increase of their tita nium content, while the internal oxidation was significantly enhanced. The corrosion mechanism of the alloys is also discussed. (C) 2001 Elsevier Scie nce Ltd. All rights reserved.