Abstract
Thermodynamic assessment of sulfur penetration through otherwise protective scales such as Cr2O3, Al2O3 has been carried out for Co-Cr- and Co-Cr-Al-base alloys. Limiting conditions for sulfide formation following gas molecular transport and solution-diffusion transport have been established and the results partially confirmed by experiments carried out on Co-10Cr, Co-25Cr, and Co-10Cr-5Al alloys in sulfurous atmospheres. The results show that molecular transport of sulfurous gas species through the growing oxide scale definitely occurs. It was not possible to confirm or disprove the solutiondiffusion mechanism.
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Singh, P., Birks, N. Penetration of sulfur through preformed protective oxide scales. Oxid Met 19, 37–52 (1983). https://doi.org/10.1007/BF00656229
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DOI: https://doi.org/10.1007/BF00656229