Laboratory Investigations of Ni-Al Coatings Exposed to Conditions Simulating Biomass Firing

Duoli Wu, Sunday Chukwudi Okoro, Kristian Vinter Dahl, Melanie Montgomery, Karen Pantleon, John Hald

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch

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Abstract

Fireside corrosion is a key problem when using biomass fuels in power plants. A possible solution is to apply corrosion resistant coatings. The present paper studies the corrosion and interdiffusion behaviour of a Ni-Al diffusion coating on austenitic stainless steel (TP347H). Ni-Al coatings were prepared by electrolytic deposition of nickel followed by pack aluminizing performed at 650˚C. A uniform and dense Ni-Al coating with an outer layer of Ni2Al3 and an inner Ni layer was formed. Samples were exposed to 560°C for 168h in an atmosphere simulating biomass combustion. This resulted in localized corrosion attack. Interdiffusion was studied by isothermal heat treatment in static air at 650˚C or 700˚C for up to 3000h. The Ni2Al3 gradually transformed into NiAl and Ni3Al during the interdiffusion process. Porosity developed at the interface between the Ni-Al coating and the Ni layer and expanded with time at both temperatures.
Original languageEnglish
Title of host publicationProceedings of the 9th International Symposium on High-Temperature Corrosion and Protection of Materials
Number of pages8
Publication date2016
Publication statusPublished - 2016
Event9th International Symposium on High-Temperature Corrosion and Protection of Materials - Les Embiez Island, France
Duration: 15 May 201620 May 2016
http://www.htcpm2016.com/

Conference

Conference9th International Symposium on High-Temperature Corrosion and Protection of Materials
CountryFrance
City Les Embiez Island
Period15/05/201620/05/2016
Internet address

Keywords

  • Ni-Al coatings
  • Interdiffusion
  • High temperature corrosion
  • Biomass-combustion

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