Hot corrosion and erosion resistance of new coating alloys for biomass and waste boiler heat transfer surfaces

Sanni Yli-Olli, Satu Tuurna, Maria Oksa, Erja Turunen, Tommi Varis

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

In the present work new coating materials have been tested in laboratory conditions simulating high temperature corrosion in biomass boilers and waste incinerators with molten salt deposits. The work also included some thermodynamic modelling and high temperature erosion testing. In the deposit corrosion tests the dense Ni- and Cr-based materials performed somewhat better than iron-based materials in means of corrosion. In the porous coatings corrosion had propagated into the coating through the pores. Inconel 625, as well as some of the other high Ni-materials, had good corrosion resistance, but the coating detached from the low alloy steel substrate material in many cases. Welded materials (MIG, laser) formed a very dense coating and therefore reacted like bulk materials and HVOF coatings were denser than arc sprayed coatings. It can be concluded that tough and dense coatings succeed best in the erosion conditions. However, due to their lamellar structure coatings are very sensitive to the size of erosive particles and the impact angle. The thermodynamic modelling supported quite well the corrosion test results, in spite of some weaknesses in the databases, e.g. content of boron. The new salt database used in some modelling cases gave good results, but should be applied with some caution.
Original languageEnglish
Title of host publicationBALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages109-122
ISBN (Electronic)978-951-38-6318-0
ISBN (Print)978-951-38-6317-3
Publication statusPublished - 2007
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 12 Jun 200714 Jun 2007

Publication series

SeriesVTT Symposium
Number247
ISSN0357-9387

Conference

ConferenceBALTICA VII - International Conference on Life Management and Main-tenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period12/06/0714/06/07

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    Yli-Olli, S., Tuurna, S., Oksa, M., Turunen, E., & Varis, T. (2007). Hot corrosion and erosion resistance of new coating alloys for biomass and waste boiler heat transfer surfaces. In BALTICA VII - Life Management and Maintenance for Power Plants. Vol. 2 (pp. 109-122). VTT Technical Research Centre of Finland. VTT Symposium, No. 247 https://www.vtt.fi/inf/pdf/symposiums/2007/S247.pdf