Cr diffusion coating to improve the corrosion resistance of an ODS steel in super-critical carbon dioxide environment

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The surface of oxide dispersion strengthened (ODS) steel was deposited with Cr by physical vapor deposition, followed by inter-diffusion heat treatment (Cr-IDHTed) to form a thin outer Cr-rich carbide layer and interdiffusion zone below it. When exposed to super-critical carbon dioxide (S-CO2) environment at 650 degrees C in 20 MPa for 500 h, a continuous and protective Cr2O3 layer was formed on Cr-IDHTed ODS steel, resulting in marked reduction in weight gain compared to the as-received one. On the other hand, thick Fe-rich oxides were formed on the as-received ODS steel, resulting in a significant weight gain. The as-received ODS steel showed near complete loss of tensile ductility after S-CO2 exposure due to extensive carburization in matrix. However, because of the presence of thin Cr-rich oxide layer on the surface, carburization was prevented and the change in tensile properties was minimized for Cr-IDHTed ODS steel.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2019-09
Language
English
Article Type
Article
Citation

SURFACE & COATINGS TECHNOLOGY, v.374, pp.666 - 673

ISSN
0257-8972
DOI
10.1016/j.surfcoat.2019.06.055
URI
http://hdl.handle.net/10203/267842
Appears in Collection
NE-Journal Papers(저널논문)
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