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Increased Lifetime for Biomass and Waste to Energy Power Plant Boilers with HVOF Coatings: High Temperature Corrosion Testing Under Chlorine-Containing Molten Salt

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Abstract

Heat exchanger surfaces of waste to energy and biomass power plant boilers experience often severe corrosion due to very aggressive components in the used fuels. High velocity oxy-fuel (HVOF) coatings offer excellent protection for boiler tubes against high temperature corrosion due to their high density and good adherence to the substrate material. Several thermal spray coatings with high chromium content were sprayed with HVOF technique. Their mechanical properties and high temperature corrosion resistance were tested and analyzed. The coating materials included NiCr, IN625, Ni-21Cr-10W-9Mo-4Cu, and iron-based partly amorphous alloy SHS9172 (Fe-25Cr-15W-12Nb-6Mo). High temperature corrosion testing was performed in NaCl-KCl-Na2SO4 salt with controlled H2O atmosphere at 575 and 625 °C. The corrosion test results of the coatings were compared to corrosion resistance of tube materials (X20, Alloy 263 and Sanicro 25).

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Acknowledgments

Mr. Mika Jokipii and Mr. Jarkko Metsäjoki are greatly acknowledged for their expertise. The authors would like to acknowledge the financial support of FP7 project NextGenPower—Meeting the Materials and Manufacturing Challenge for Ultra High Efficiency PF Power Plants with CCS, and all the partners involved.

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Authors and Affiliations

  1. VTT Technical Research Centre of Finland, Espoo, Finland

    Maria Oksa & Tommi Varis

  2. VTT Technical Research Centre of Finland, Tampere, Finland

    Satu Tuurna

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  1. Maria Oksa
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  2. Satu Tuurna
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  3. Tommi Varis
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Correspondence to Maria Oksa.

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Oksa, M., Tuurna, S. & Varis, T. Increased Lifetime for Biomass and Waste to Energy Power Plant Boilers with HVOF Coatings: High Temperature Corrosion Testing Under Chlorine-Containing Molten Salt. J Therm Spray Tech 22, 783–796 (2013). https://doi.org/10.1007/s11666-013-9928-5

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  • DOI: https://doi.org/10.1007/s11666-013-9928-5

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