Effect of molten V2O5 salt on the corrosion behavior of micro- and nano-structured thermal sprayed SYSZ and YSZ coatings

M. R. Loghman-Estarki; R. Shoja Razavi; H. Jamali

doi:10.1016/j.ceramint.2016.05.047

Effect of molten V₂O₅ salt on the corrosion behavior of micro- and nano-structured thermal sprayed SYSZ and YSZ coatings

M. R. Loghman-Estarki
, R. Shoja Razavi
, H. Jamali

Research output: Journal Publication › Article › peer-review

22 Citations (Scopus)

Abstract

The corrosion resistance of micro-and nano-structured scandia and yttria codoped zirconia (nano-4 mol%SYSZ and micro-8.6SYSZ) and yttria doped zirconia (4YSZ) in the presence of molten vanadium oxide were investigated. To this end, duplex TBCs (thermal barrier coatings), composed of a bond coat (NiCrAlY) and a top coat (4SYSZ or 4YSZ), were deposited on the IN738LC Ni-based supper-alloy by atmospheric plasma spraying (APS). The corrosion studies of plasma sprayed TBCs were conducted in 25 mg V₂O₅ molten salt at 910 °C for different times. The nanostructured coating, as compared to its micro-structured counterpart, in spite of a further reaction with the V₂O₅ salt, showed a higher degradation resistance during the corrosion test due to increased compliance capabilities resulting from the presence of an extra source of porosity associated with the nano-zones. Finally, the corrosion resistance and degradation mechanism of SYSZ and YSZ coatings were compared with the presence of molten NaVO₃ and V₂O₅ salt, respectively.

Original language	English
Pages (from-to)	12825-12837
Number of pages	13
Journal	Ceramics International
Volume	42
Issue number	11
DOIs	https://doi.org/10.1016/j.ceramint.2016.05.047
Publication status	Published - 15 Aug 2016
Externally published	Yes

Free Keywords

Atmospheric plasma spray
Corrosion
Nano-structured thermal barrier coating
SYSZ, YSZ, VO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.ceramint.2016.05.047

Cite this

@article{d5c6b418d90b4c97a73a6dc63d014e87,

title = "Effect of molten V2O5 salt on the corrosion behavior of micro- and nano-structured thermal sprayed SYSZ and YSZ coatings",

abstract = "The corrosion resistance of micro-and nano-structured scandia and yttria codoped zirconia (nano-4 mol\%SYSZ and micro-8.6SYSZ) and yttria doped zirconia (4YSZ) in the presence of molten vanadium oxide were investigated. To this end, duplex TBCs (thermal barrier coatings), composed of a bond coat (NiCrAlY) and a top coat (4SYSZ or 4YSZ), were deposited on the IN738LC Ni-based supper-alloy by atmospheric plasma spraying (APS). The corrosion studies of plasma sprayed TBCs were conducted in 25 mg V2O5 molten salt at 910 °C for different times. The nanostructured coating, as compared to its micro-structured counterpart, in spite of a further reaction with the V2O5 salt, showed a higher degradation resistance during the corrosion test due to increased compliance capabilities resulting from the presence of an extra source of porosity associated with the nano-zones. Finally, the corrosion resistance and degradation mechanism of SYSZ and YSZ coatings were compared with the presence of molten NaVO3 and V2O5 salt, respectively.",

keywords = "Atmospheric plasma spray, Corrosion, Nano-structured thermal barrier coating, SYSZ, YSZ, VO",

author = "Loghman-Estarki, \{M. R.\} and \{Shoja Razavi\}, R. and H. Jamali",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd and Techna Group S.r.l.",

year = "2016",

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doi = "10.1016/j.ceramint.2016.05.047",

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T1 - Effect of molten V2O5 salt on the corrosion behavior of micro- and nano-structured thermal sprayed SYSZ and YSZ coatings

AU - Loghman-Estarki, M. R.

AU - Shoja Razavi, R.

AU - Jamali, H.

PY - 2016/8/15

Y1 - 2016/8/15

N2 - The corrosion resistance of micro-and nano-structured scandia and yttria codoped zirconia (nano-4 mol%SYSZ and micro-8.6SYSZ) and yttria doped zirconia (4YSZ) in the presence of molten vanadium oxide were investigated. To this end, duplex TBCs (thermal barrier coatings), composed of a bond coat (NiCrAlY) and a top coat (4SYSZ or 4YSZ), were deposited on the IN738LC Ni-based supper-alloy by atmospheric plasma spraying (APS). The corrosion studies of plasma sprayed TBCs were conducted in 25 mg V2O5 molten salt at 910 °C for different times. The nanostructured coating, as compared to its micro-structured counterpart, in spite of a further reaction with the V2O5 salt, showed a higher degradation resistance during the corrosion test due to increased compliance capabilities resulting from the presence of an extra source of porosity associated with the nano-zones. Finally, the corrosion resistance and degradation mechanism of SYSZ and YSZ coatings were compared with the presence of molten NaVO3 and V2O5 salt, respectively.

AB - The corrosion resistance of micro-and nano-structured scandia and yttria codoped zirconia (nano-4 mol%SYSZ and micro-8.6SYSZ) and yttria doped zirconia (4YSZ) in the presence of molten vanadium oxide were investigated. To this end, duplex TBCs (thermal barrier coatings), composed of a bond coat (NiCrAlY) and a top coat (4SYSZ or 4YSZ), were deposited on the IN738LC Ni-based supper-alloy by atmospheric plasma spraying (APS). The corrosion studies of plasma sprayed TBCs were conducted in 25 mg V2O5 molten salt at 910 °C for different times. The nanostructured coating, as compared to its micro-structured counterpart, in spite of a further reaction with the V2O5 salt, showed a higher degradation resistance during the corrosion test due to increased compliance capabilities resulting from the presence of an extra source of porosity associated with the nano-zones. Finally, the corrosion resistance and degradation mechanism of SYSZ and YSZ coatings were compared with the presence of molten NaVO3 and V2O5 salt, respectively.

KW - Atmospheric plasma spray

KW - Corrosion

KW - Nano-structured thermal barrier coating

KW - SYSZ, YSZ, VO

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DO - 10.1016/j.ceramint.2016.05.047

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