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Effect of water vapor on the oxidation behavior of HVAF‐sprayed NiCr and NiCrAlY coatings
Author(s) -
Sadeghimeresht Esmaeil,
Eklund Johan,
Phother Simon Julien,
Liske Jesper,
Markocsan Nicolaie,
Joshi Shrikant
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201710005
Subject(s) - nichrome , materials science , metallurgy , alloy , isothermal process , oxide , substrate (aquarium) , metal , oceanography , physics , thermodynamics , geology
Isothermal oxidation behavior of NiCr and NiCrAlY coatings deposited onto low alloy 16Mo3 steel by high‐velocity air fuel (HVAF) process was investigated in 5% O 2 + 20% H 2 O + N 2 at 600 °C for 168 h. Whereas NiCrAlY showed lower mass gain compared to NiCr, both coatings succeeded in maintaining the integrity with the substrate during the exposure without any breakaway oxidation. A thin Cr‐rich oxide scale (Cr 2 O 3 ) formed on NiCr, and a thin mixed oxide scale (Al 2 O 3 with NiCr 2 O 4 ) formed on NiCrAlY significantly increasing the oxidation protection in the presence of water vapor.