Corrosion behavior of superheater steels in the presence of potassium salts under conditions relevant to biomass combustion

Juho Lehmusto, Patrik Yrjas, Skrifvars Bengt-Johan, Mikko Hupa

    Research output: Chapter in Book/Conference proceedingConference contributionScientific


    The corrosion resistance of three steels; a ferritic 10CrMo type steel, an austenitic 304L type steel, and a nickel-based Alloy 625 type steel, to both solid KCl and K2CO3 was investigated in the laboratory. Samples were covered with either KCl or K2CO3 and held for 168h under two different atmospheres: dry air, and air with a water content of 30%. Analyses were performed with SEM/EDXA to determine the extent of corrosion, the elemental distribution, and for the identification of corrosion products. Both salts were found to be corrosive, and furthermore, water vapor was found to affect the reaction behavior of the salts. Alloy 625 exhibited the best corrosion resistance, whereas 10CrMo did not perform well even under the mildest conditions.
    Original languageUndefined/Unknown
    Title of host publication8th International Symposium on High-Temperature Corrosion and Protection of Materials
    Editors N/A
    Publication statusPublished - 2012
    MoE publication typeB3 Non-refereed article in conference proceedings
    Eventconference; 2012-05-20; 2012-05-25 - 8th International Symposium on High-Temperature Corrosion and Protection of Materials (HTPCM2012)
    Duration: 20 May 201225 May 2012


    Conferenceconference; 2012-05-20; 2012-05-25


    • Austenitic steel
    • Ferritic steel
    • Nickel-based alloy
    • Potassium carbonate
    • Potassium chloride

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