High temperature corrosion resistance of HVOF coatings in a NaCl-KCl-Na2SO4 salt

Maria Oksa, Satu Tuurna, Tommi Varis

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

    Abstract

    Thermal spray coatings can be used for high temperature corrosion protection of heat exchanger surfaces in power plant boilers. In this study, several thermal spray coatings with high chromium content were manufactured with HVOF (high velocity oxy-fuel) technique, and their mechanical properties and high temperature corrosion resistance were tested and analysed. The coating materials included NiCr, IN625 and iron based steel alloy with a nanoscale microstructure Nanosteel SHS9172. High temperature corrosion testing was made in NaCl-KCl-Na2SO4 salt with controlled H2O atmosphere, in temperatures 575 and 625 C. The effect of coating process and following characteristics of the coatings on high temperature corrosion protection properties was analysed. The corrosion test results of the coatings were compared to corrosion resistance of bulk materials (X20, Alloy 263 and Sanicro 25)
    Original languageEnglish
    Title of host publicationEuropean Corrosion Congress (EUROCORR 2012)
    Subtitle of host publicationSafer World Through Better Corrosion Control
    PublisherEuropean Federation of Corrosion EFC
    Number of pages12
    ISBN (Print)978-1-5108-3592-4
    Publication statusPublished - 2012
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventEuropean Corrosion Congress Eurocorr 2012 - Istanbul, Turkey
    Duration: 9 Sep 201213 Sep 2012

    Conference

    ConferenceEuropean Corrosion Congress Eurocorr 2012
    Abbreviated titleEurocorr 2012
    CountryTurkey
    CityIstanbul
    Period9/09/1213/09/12

    Keywords

    • High temperature corrosion
    • coating
    • thermal spray
    • HVOF
    • biomass

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  • Cite this

    Oksa, M., Tuurna, S., & Varis, T. (2012). High temperature corrosion resistance of HVOF coatings in a NaCl-KCl-Na2SO4 salt. In European Corrosion Congress (EUROCORR 2012) : Safer World Through Better Corrosion Control European Federation of Corrosion EFC.