Abstract No.:
5448

 Scheduled at:
Thursday, June 08, 2017, Hall 14 12:20 PM
Industrial Forum II


 Title:
Wire arc spray coatings for high temperature corrosion protection in waste incineration plants

 Authors:
Benedikt Allebrodt* / DURUM Verschleiss-Schutz GmbH, Germany
Frank Schreiber / DURUM VERSCHLEISS-SCHUTZ GmbH, Germany

 Abstract:
High temperature corrosion is one of the biggest problems in biomass and co-fired waste incineration power plants. Critical areas like the superheaters and heat exchanger surfaces are prone to corrosion due to the presence of detrimental substances such as heavy metal salts containing chlorides and alkali metals. The extension of the service lifetime of these components is one of the critical goals to develop and strengthen this technology in the power generation market. In the focus of this research are thermal spray coatings which were applied by wire arc spraying with flux-cored wires. The combination of easy to use and cost-effective arc spraying with high performance flux-cored wires offers the capabilities for high quality coatings which are still affordable and tailored to the application. Six different iron and nickel-based coating materials, including cost effective, amorphous FeCr(MoW)B-alloys and highly corrosion resistant NiCrMoW and NiCr(Mo)Ti-alloys, were examined as improved variants of existing arc-spray solutions. These materials were sprayed on 1.5415-steel and analyzed regarding their corrosion behavior in purely oxidizing environments at 750°C, in chloride-rich salts at 550°C and wear behavior regarding abrasive and erosive attack. Furthermore the spraying characteristics of these coating materials were examined with SEM/EDX and light microscopy in regards to density in the coating structure, spraying efficiency and residual stresses.

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