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 language | English |
---|---|
Title of host publication | Proceedings of the 9th International Symposium on High-Temperature Corrosion and Protection of Materials |
Number of pages | 8 |
Publication date | 2016 |
Publication status | Published - 2016 |
Event | 9th International Symposium on High-Temperature Corrosion and Protection of Materials - Les Embiez Island, France Duration: 15 May 2016 → 20 May 2016 http://www.htcpm2016.com/ |
Conference
Conference | 9th International Symposium on High-Temperature Corrosion and Protection of Materials |
---|---|
Country/Territory | France |
City | Les Embiez Island |
Period | 15/05/2016 → 20/05/2016 |
Internet address |
Keywords
- Ni-Al coatings
- Interdiffusion
- High temperature corrosion
- Biomass-combustion