Corrosion and Carburization Behaviour of Ni-xCr Binary Alloys in a High-Temperature Supercritical-Carbon Dioxide Environment

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Pure Ni and Ni-xCr (x = 7, 14, 22 and 27 wt%) binary alloys were exposed to supercritical-carbon dioxide environment at 600 degrees C and 20 MPa for 200 h. For pure Ni, a thick NiO layer was formed on the surface. Meanwhile, for Ni-7Cr alloy, an inner oxide layer consisted of rather irregular chromia and NiO was formed below the outer NiO layer. When Cr content was greater than 14%, a continuous chromia layer was formed, resulting in much lower weight gain and oxide thickness. However, amorphous carbon layers had developed along the oxide-matrix interface when chromia was formed. The presence of the carbon layer was explained in view of the high C activity corresponding to the low equilibrium oxygen potential of chromia.
Publisher
SPRINGER/PLENUM PUBLISHERS
Issue Date
2018-06
Language
English
Article Type
Article
Keywords

FE-CR ALLOYS; OXIDATION BEHAVIOR; STAINLESS-STEEL; CO2; CYCLES; NICKEL; SCALES; GASES; HEAT

Citation

OXIDATION OF METALS, v.89, no.5-6, pp.683 - 697

ISSN
0030-770X
DOI
10.1007/s11085-017-9811-8
URI
http://hdl.handle.net/10203/242329
Appears in Collection
NE-Journal Papers(저널논문)
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