Abstract
Corrosion behaviour of Fe–Cr (15, 20, 25, or 30 wt.%) alloys in wet CO2 without and with HCl (0.05 or 0.1 vol%) at 750 °C was investigated. The results are compared with those at 650 °C to reveal the temperature effect. In general, weight gain kinetics and oxide scaling rates decreased with the increased chromium levels. The effect of temperature on weight gains and oxide scaling was strongly dependent on NCr. For the 15 and 20 Cr alloys, rates increased with temperature in all conditions. However, for the 25 Cr alloy, the rate increased with temperature in HCl free gas, but decreased with temperature when HCl was present. The 30 Cr alloy experienced very small weight gains which slightly increased with T. Cross-section analysis revealed the formation of thick multi-layered oxides for Fe–15Cr and Fe–20Cr, a semi-protective duplex scale of Fe2O3 and Cr2O3 on Fe–25Cr, and a thin protective chromia scale for Fe–30Cr at both temperatures. Both oxide growth rate and oxide constitution were affected by temperature, NCr, and \({p}_{HCl}\). The correlation of these factors is discussed by considering interactions between the oxides and chlorine inside the different scale types.
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Financial support by the Australian Research Council under the Discovery Scheme is gratefully acknowledged.
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Aye, K.K., Cai, Y., Zhang, J. et al. Effect of Temperature on Corrosion Behaviour of Fe–Cr Alloys in Wet CO2 With and Without HCl Gases. Oxid Met 97, 371–400 (2022). https://doi.org/10.1007/s11085-021-10092-1
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DOI: https://doi.org/10.1007/s11085-021-10092-1