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Author: search.filters.author.Wiman, PanyaSubject: search.filters.subject.Volatilisation

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    Effects of temperature and water vapour on Cr-species volatilisation, oxidation and scale adhesion of a Type 409L stainless steel for application as interconnect of low temperature solid oxide fuel cells
    (2024-06-01)
    Homjabok, Wanna
    ;
    Tengprasert, Watcharapon
    ;
    Thublaor, Thammaporn
    ;
    Wiman, Panya
    ;
    Nilsonthi, Thanasak
    Though the classical transport theory does not mathematically express the Arrhenius-like relation between Cr-loss flux due to volatilisation and absolute temperature, such relation was experimentally observed for 409L stainless steel exposed at 600–750 °C. Volatilisation calculation in the present cases can be estimated giving such relation because of the nearly linear relation between mass transfer coefficient and temperature. Cr-loss fluxes in O<inf>2</inf> with 20 and 40 % H<inf>2</inf>O are close to or coincided with the fluxes calculated from MnCr<inf>2</inf>O<inf>4</inf> evaporation. Increasing water vapour could enhance volatilisation contributed from the raised CrO<inf>2</inf>(OH)<inf>2</inf> pressure, reduce oxidation rate, and worsen scale adhesion.
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    Corrosion behaviour of AISI 430 stainless steel in O2-40%H2O at 800 °C
    (2022-07-15)
    Wiman, Panya
    ;
    Thublaor, Thammaporn
    ;
    Rojhirunsakool, Tanaporn
    ;
    Bidabadi, Mohammad Hassan Shirani
    ;
    Yang, Zhi Gang
    Less mass gain and poorer scale adhesion assessed by the tensile test of the AISI 430 stainless steel exposed to O<inf>2</inf>-40%H<inf>2</inf>O at 800 °C were observed in comparison with the exposure to O<inf>2</inf>. The reduced mass gain was partly due to Cr-species volatilisation while the worse scale adhesion related to pores formed at scale/steel interface. The Brouwer diagrams were proposed to help discuss the water vapour effect on altering defect concentrations that could affect the oxidation rate and scale adhesion of the studied steel.
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