Corrosion behaviour of Ni and nickel aluminide coatings exposed in a biomass fired power plant for two years

D. L. Wu; K. V. Dahl; T. L. Christiansen; M. Montgomery; J. Hald

doi:10.1016/j.surfcoat.2018.12.129

Corrosion behaviour of Ni and nickel aluminide coatings exposed in a biomass fired power plant for two years

D. L. Wu^*, K. V. Dahl, T. L. Christiansen, M. Montgomery, J. Hald

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

Ni and Ni₂Al₃ coatings were applied to superheater tubes that were built into a wood-fired boiler with an outlet steam temperature of 520 °C. The present paper evaluates the performance of the coatings after two years of service. The corrosion performance of the coatings is discussed with respect to the temperature histograms and deposit composition and compared to the performance of the coatings after the first year. The Ni coatings showed extremely protective behaviour for 1 year however after 2 years exposure, the Ni coating was chemically attacked, thick NiO was formed and sulphur containing precipitates were present at the base of the Ni layer indicating grain boundary ingress of corrosive species. For the Ni₂Al₃ coatings, localized attack was observed after the first year of exposure, but after two years no intact nickel aluminide coatings were observed.

Original language	English
Journal	Surface and Coatings Technology
Volume	362
Pages (from-to)	355-365
ISSN	0257-8972
DOIs	https://doi.org/10.1016/j.surfcoat.2018.12.129
Publication status	Published - 2019

Keywords

Biomass combustion
Fireside corrosion
Ni coating
Ni2Al3 coating
Power plant testing

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10.1016/j.surfcoat.2018.12.129

Duoli Wu revised after reviewAccepted author manuscript, 3.16 MB

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@article{7fd3b58cf19f4d04923e1f70bf14d998,

title = "Corrosion behaviour of Ni and nickel aluminide coatings exposed in a biomass fired power plant for two years",

abstract = "Ni and Ni2Al3 coatings were applied to superheater tubes that were built into a wood-fired boiler with an outlet steam temperature of 520 °C. The present paper evaluates the performance of the coatings after two years of service. The corrosion performance of the coatings is discussed with respect to the temperature histograms and deposit composition and compared to the performance of the coatings after the first year. The Ni coatings showed extremely protective behaviour for 1 year however after 2 years exposure, the Ni coating was chemically attacked, thick NiO was formed and sulphur containing precipitates were present at the base of the Ni layer indicating grain boundary ingress of corrosive species. For the Ni2Al3 coatings, localized attack was observed after the first year of exposure, but after two years no intact nickel aluminide coatings were observed.",

keywords = "Biomass combustion, Fireside corrosion, Ni coating, Ni2Al3 coating, Power plant testing",

author = "Wu, {D. L.} and Dahl, {K. V.} and Christiansen, {T. L.} and M. Montgomery and J. Hald",

year = "2019",

doi = "10.1016/j.surfcoat.2018.12.129",

language = "English",

volume = "362",

pages = "355--365",

journal = "Surface and Coatings Technology",

issn = "0257-8972",

publisher = "Elsevier",

}

TY - JOUR

T1 - Corrosion behaviour of Ni and nickel aluminide coatings exposed in a biomass fired power plant for two years

AU - Wu, D. L.

AU - Dahl, K. V.

AU - Christiansen, T. L.

AU - Montgomery, M.

AU - Hald, J.

PY - 2019

Y1 - 2019

N2 - Ni and Ni2Al3 coatings were applied to superheater tubes that were built into a wood-fired boiler with an outlet steam temperature of 520 °C. The present paper evaluates the performance of the coatings after two years of service. The corrosion performance of the coatings is discussed with respect to the temperature histograms and deposit composition and compared to the performance of the coatings after the first year. The Ni coatings showed extremely protective behaviour for 1 year however after 2 years exposure, the Ni coating was chemically attacked, thick NiO was formed and sulphur containing precipitates were present at the base of the Ni layer indicating grain boundary ingress of corrosive species. For the Ni2Al3 coatings, localized attack was observed after the first year of exposure, but after two years no intact nickel aluminide coatings were observed.

AB - Ni and Ni2Al3 coatings were applied to superheater tubes that were built into a wood-fired boiler with an outlet steam temperature of 520 °C. The present paper evaluates the performance of the coatings after two years of service. The corrosion performance of the coatings is discussed with respect to the temperature histograms and deposit composition and compared to the performance of the coatings after the first year. The Ni coatings showed extremely protective behaviour for 1 year however after 2 years exposure, the Ni coating was chemically attacked, thick NiO was formed and sulphur containing precipitates were present at the base of the Ni layer indicating grain boundary ingress of corrosive species. For the Ni2Al3 coatings, localized attack was observed after the first year of exposure, but after two years no intact nickel aluminide coatings were observed.

KW - Biomass combustion

KW - Fireside corrosion

KW - Ni coating

KW - Ni2Al3 coating

KW - Power plant testing

U2 - 10.1016/j.surfcoat.2018.12.129

DO - 10.1016/j.surfcoat.2018.12.129

M3 - Journal article

VL - 362

SP - 355

EP - 365

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

ER -