Corrosion resistance of HVOC coatings in a biofuel boiler plant

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Corrosion and erosion protection of superheaters in power plant boilers could be improved by using thermal spray coatings. By applying a dense coating layer over a conventionally used material, the properties of the component surface can be tailored more flexible based on the environmental demands, such as erosion and corrosion. In this paper corrosion and erosion resistance of thermally sprayed coatings in boiler superheater conditions is studied. HVOF coatings were tested on aircooled probe exposure in bubbling fluidized bed (BFB) boiler burning biofuels, recycled fuels and peat. Tested materials were NiCr and Cr3C2-based coatings and reference material was lowalloyed steel 10CrMo 9 10. Exposure times were several hundred hours. Specimens were analysed with SEM/EDX. Deposits on superheater tubes containing e.g. potassium, sulphur, calcium, sodium, and chlorine can cause severe corrosion problems for conventional metal alloys. Results of the exposure showed very good performance of coated specimens compared to the reference material 10CrMo 9 10. Critical factors of the coating are density and adherence to the substrate material. Some problems may rise from differences in thermal expansion coefficient, which can cause crack formation in the coating.
Original languageEnglish
Title of host publicationBook of abstracts and Proceedings (CD-ROM)
Place of PublicationLissabon
PublisherEuropean Federation of Corrosion EFC
ISBN (Print)972-95921-1-X
Publication statusPublished - 2005
MoE publication typeA4 Article in a conference publication
EventEuropean Corrosion Congress, Eurocorr 2005 - Lisbon, Portugal
Duration: 4 Sep 20058 Sep 2005

Conference

ConferenceEuropean Corrosion Congress, Eurocorr 2005
Abbreviated titleEurocorr 2005
CountryPortugal
CityLisbon
Period4/09/058/09/05

Fingerprint

Biofuels
Boilers
Corrosion resistance
Coatings
Corrosion
Superheaters
Erosion
Superheater tubes
Sprayed coatings
Peat
Crack initiation
Fluidized beds
Chlorine
Thermal expansion
Potassium
Energy dispersive spectroscopy
Calcium
Power plants
Deposits
Sulfur

Keywords

  • coatings
  • HVOC
  • high temperature corrosion
  • biofuels
  • boilers

Cite this

Oksa, M., Kärki, J., Varis, T., & Turunen, E. (2005). Corrosion resistance of HVOC coatings in a biofuel boiler plant. In Book of abstracts and Proceedings (CD-ROM) [421] Lissabon: European Federation of Corrosion EFC.
Oksa, Maria ; Kärki, Janne ; Varis, Tommi ; Turunen, Erja. / Corrosion resistance of HVOC coatings in a biofuel boiler plant. Book of abstracts and Proceedings (CD-ROM). Lissabon : European Federation of Corrosion EFC, 2005.
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Oksa, M, Kärki, J, Varis, T & Turunen, E 2005, Corrosion resistance of HVOC coatings in a biofuel boiler plant. in Book of abstracts and Proceedings (CD-ROM)., 421, European Federation of Corrosion EFC, Lissabon, European Corrosion Congress, Eurocorr 2005, Lisbon, Portugal, 4/09/05.

Corrosion resistance of HVOC coatings in a biofuel boiler plant. / Oksa, Maria; Kärki, Janne; Varis, Tommi; Turunen, Erja.

Book of abstracts and Proceedings (CD-ROM). Lissabon : European Federation of Corrosion EFC, 2005. 421.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - Corrosion resistance of HVOC coatings in a biofuel boiler plant

AU - Oksa, Maria

AU - Kärki, Janne

AU - Varis, Tommi

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N2 - Corrosion and erosion protection of superheaters in power plant boilers could be improved by using thermal spray coatings. By applying a dense coating layer over a conventionally used material, the properties of the component surface can be tailored more flexible based on the environmental demands, such as erosion and corrosion. In this paper corrosion and erosion resistance of thermally sprayed coatings in boiler superheater conditions is studied. HVOF coatings were tested on aircooled probe exposure in bubbling fluidized bed (BFB) boiler burning biofuels, recycled fuels and peat. Tested materials were NiCr and Cr3C2-based coatings and reference material was lowalloyed steel 10CrMo 9 10. Exposure times were several hundred hours. Specimens were analysed with SEM/EDX. Deposits on superheater tubes containing e.g. potassium, sulphur, calcium, sodium, and chlorine can cause severe corrosion problems for conventional metal alloys. Results of the exposure showed very good performance of coated specimens compared to the reference material 10CrMo 9 10. Critical factors of the coating are density and adherence to the substrate material. Some problems may rise from differences in thermal expansion coefficient, which can cause crack formation in the coating.

AB - Corrosion and erosion protection of superheaters in power plant boilers could be improved by using thermal spray coatings. By applying a dense coating layer over a conventionally used material, the properties of the component surface can be tailored more flexible based on the environmental demands, such as erosion and corrosion. In this paper corrosion and erosion resistance of thermally sprayed coatings in boiler superheater conditions is studied. HVOF coatings were tested on aircooled probe exposure in bubbling fluidized bed (BFB) boiler burning biofuels, recycled fuels and peat. Tested materials were NiCr and Cr3C2-based coatings and reference material was lowalloyed steel 10CrMo 9 10. Exposure times were several hundred hours. Specimens were analysed with SEM/EDX. Deposits on superheater tubes containing e.g. potassium, sulphur, calcium, sodium, and chlorine can cause severe corrosion problems for conventional metal alloys. Results of the exposure showed very good performance of coated specimens compared to the reference material 10CrMo 9 10. Critical factors of the coating are density and adherence to the substrate material. Some problems may rise from differences in thermal expansion coefficient, which can cause crack formation in the coating.

KW - coatings

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BT - Book of abstracts and Proceedings (CD-ROM)

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Oksa M, Kärki J, Varis T, Turunen E. Corrosion resistance of HVOC coatings in a biofuel boiler plant. In Book of abstracts and Proceedings (CD-ROM). Lissabon: European Federation of Corrosion EFC. 2005. 421