Coatings for high temperature corrosion protection in advanced power plants

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

Abstract

When aiming to decrease of greenhouse gas emissions and higher cost-efficiency, power plants would benefit from increased efficiency. Advanced power plants are aiming for up to 750°C steam temperatures. Higher steam temperatures will set higher requirements to tube materials, as especially difficult fuels can cause severe corrosion conditions. Biomass and waste include chlorides, sulfates and heavy metals, such as NaCl, KCl, K2SO4, Pb and Zn, that can substantially accelerate the corrosion even at lower temperatures. Corrosion protection properties of thermal spray coatings were validated in a co-fired boiler using biomass, coal and solid recovered fuel. Material testing was performed with a temperature controlled probe at 550 and 750°C for 3000 hours. Corrosion performance of six high velocity oxy-fuel (HVOF) coatings, FeCr, Ni46Cr, Ni26Cr, NiCrAlY and Al2O3, were evaluated, and a ferritic steel T92 and a nickel based alloy 740H were applied as reference materials. Maximum corrosion rates varied from 0.01 mm/y of Ni-based coatings to 0.4 mm/y of T92 at 550°C and from 0.1 mm/y of A740H to 0.5 mm/y of Fe-based coating at 750°C. The nickel-based coatings and the ceramic Al2O3 coating gave excellent protection to the ferritic steel at 550°C and sufficient protection at 750°C.
Original languageEnglish
Title of host publicationBaltica X
Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
EditorsPertti Auerkari
PublisherVTT Technical Research Centre of Finland
Number of pages11
ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
Duration: 7 Jun 20169 Jun 2016

Publication series

SeriesVTT Technology
Volume261

Conference

ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
Abbreviated titleBaltica X
CountryFinland
CityHelsinki-Stockholm
Period7/06/169/06/16

Fingerprint

Corrosion protection
Power plants
Coatings
Ferritic steel
Corrosion
Biomass
Steam
Temperature
Nickel
Ceramic coatings
Materials testing
Corrosion rate
Gas emissions
Greenhouse gases
Heavy metals
Boilers
Coal
Costs

Cite this

Oksa, M., & Metsäjoki, J. (2016). Coatings for high temperature corrosion protection in advanced power plants. In P. Auerkari (Ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants VTT Technical Research Centre of Finland. VTT Technology, Vol.. 261
Oksa, Maria ; Metsäjoki, Jarkko. / Coatings for high temperature corrosion protection in advanced power plants. Baltica X: International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari. VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).
@inproceedings{9167b7ec583c4676b1a1d8f4161d21a3,
title = "Coatings for high temperature corrosion protection in advanced power plants",
abstract = "When aiming to decrease of greenhouse gas emissions and higher cost-efficiency, power plants would benefit from increased efficiency. Advanced power plants are aiming for up to 750°C steam temperatures. Higher steam temperatures will set higher requirements to tube materials, as especially difficult fuels can cause severe corrosion conditions. Biomass and waste include chlorides, sulfates and heavy metals, such as NaCl, KCl, K2SO4, Pb and Zn, that can substantially accelerate the corrosion even at lower temperatures. Corrosion protection properties of thermal spray coatings were validated in a co-fired boiler using biomass, coal and solid recovered fuel. Material testing was performed with a temperature controlled probe at 550 and 750°C for 3000 hours. Corrosion performance of six high velocity oxy-fuel (HVOF) coatings, FeCr, Ni46Cr, Ni26Cr, NiCrAlY and Al2O3, were evaluated, and a ferritic steel T92 and a nickel based alloy 740H were applied as reference materials. Maximum corrosion rates varied from 0.01 mm/y of Ni-based coatings to 0.4 mm/y of T92 at 550°C and from 0.1 mm/y of A740H to 0.5 mm/y of Fe-based coating at 750°C. The nickel-based coatings and the ceramic Al2O3 coating gave excellent protection to the ferritic steel at 550°C and sufficient protection at 750°C.",
author = "Maria Oksa and Jarkko Mets{\"a}joki",
year = "2016",
language = "English",
series = "VTT Technology",
publisher = "VTT Technical Research Centre of Finland",
editor = "Pertti Auerkari",
booktitle = "Baltica X",
address = "Finland",

}

Oksa, M & Metsäjoki, J 2016, Coatings for high temperature corrosion protection in advanced power plants. in P Auerkari (ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, VTT Technology, vol. 261, BALTICA X - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 7/06/16.

Coatings for high temperature corrosion protection in advanced power plants. / Oksa, Maria; Metsäjoki, Jarkko.

Baltica X: International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari. VTT Technical Research Centre of Finland, 2016. (VTT Technology, Vol. 261).

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

TY - GEN

T1 - Coatings for high temperature corrosion protection in advanced power plants

AU - Oksa, Maria

AU - Metsäjoki, Jarkko

PY - 2016

Y1 - 2016

N2 - When aiming to decrease of greenhouse gas emissions and higher cost-efficiency, power plants would benefit from increased efficiency. Advanced power plants are aiming for up to 750°C steam temperatures. Higher steam temperatures will set higher requirements to tube materials, as especially difficult fuels can cause severe corrosion conditions. Biomass and waste include chlorides, sulfates and heavy metals, such as NaCl, KCl, K2SO4, Pb and Zn, that can substantially accelerate the corrosion even at lower temperatures. Corrosion protection properties of thermal spray coatings were validated in a co-fired boiler using biomass, coal and solid recovered fuel. Material testing was performed with a temperature controlled probe at 550 and 750°C for 3000 hours. Corrosion performance of six high velocity oxy-fuel (HVOF) coatings, FeCr, Ni46Cr, Ni26Cr, NiCrAlY and Al2O3, were evaluated, and a ferritic steel T92 and a nickel based alloy 740H were applied as reference materials. Maximum corrosion rates varied from 0.01 mm/y of Ni-based coatings to 0.4 mm/y of T92 at 550°C and from 0.1 mm/y of A740H to 0.5 mm/y of Fe-based coating at 750°C. The nickel-based coatings and the ceramic Al2O3 coating gave excellent protection to the ferritic steel at 550°C and sufficient protection at 750°C.

AB - When aiming to decrease of greenhouse gas emissions and higher cost-efficiency, power plants would benefit from increased efficiency. Advanced power plants are aiming for up to 750°C steam temperatures. Higher steam temperatures will set higher requirements to tube materials, as especially difficult fuels can cause severe corrosion conditions. Biomass and waste include chlorides, sulfates and heavy metals, such as NaCl, KCl, K2SO4, Pb and Zn, that can substantially accelerate the corrosion even at lower temperatures. Corrosion protection properties of thermal spray coatings were validated in a co-fired boiler using biomass, coal and solid recovered fuel. Material testing was performed with a temperature controlled probe at 550 and 750°C for 3000 hours. Corrosion performance of six high velocity oxy-fuel (HVOF) coatings, FeCr, Ni46Cr, Ni26Cr, NiCrAlY and Al2O3, were evaluated, and a ferritic steel T92 and a nickel based alloy 740H were applied as reference materials. Maximum corrosion rates varied from 0.01 mm/y of Ni-based coatings to 0.4 mm/y of T92 at 550°C and from 0.1 mm/y of A740H to 0.5 mm/y of Fe-based coating at 750°C. The nickel-based coatings and the ceramic Al2O3 coating gave excellent protection to the ferritic steel at 550°C and sufficient protection at 750°C.

M3 - Conference article in proceedings

T3 - VTT Technology

BT - Baltica X

A2 - Auerkari, Pertti

PB - VTT Technical Research Centre of Finland

ER -

Oksa M, Metsäjoki J. Coatings for high temperature corrosion protection in advanced power plants. In Auerkari P, editor, Baltica X: International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland. 2016. (VTT Technology, Vol. 261).