Surface modification of austenitic stainless steel for corrosion resistance in high temperature supercritical-carbon dioxide environment

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Surface-modification was applied to austenitic stainless steel 316LN in order to improve the corrosion resistance in high temperature supercritical-carbon dioxide (S-CO2) environment. The surface-modification methods consisted of deposition of either a single Al layer or a NiAl bi-layer on the surface, followed by inter-diffusion heat treatments. The former resulted in formation of a surface layer composed of a mixture of NiAl and ferrite phases, and the latter resulted in formation of a continuous NiAl surface layer. Surface-modified 316LN showed reduced weight gains than the as-received 316LN alloy after exposure to S-CO2 at 650 degrees C (20 MPa) for 500 h. Pre-oxidation in helium at 900 degrees C before S-CO2 exposure further improved corrosion resistance by forming inner a Al2O3 layer. On the other hand, the extent of inter-diffusion zone was less for the specimen with a continuous NiAl surface layer before and after S-CO2 exposure.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2018-09
Language
English
Article Type
Article
Keywords

FERRITIC-MARTENSITIC STEELS; CO2 BRAYTON CYCLES; ALUMINIDE COATINGS; OXIDATION; ALLOYS; BEHAVIOR

Citation

SURFACE & COATINGS TECHNOLOGY, v.349, pp.415 - 425

ISSN
0257-8972
DOI
10.1016/j.surfcoat.2018.06.014
URI
http://hdl.handle.net/10203/245553
Appears in Collection
NE-Journal Papers(저널논문)
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