Chlorine-induced high-temperature corrosion is a major problem for structural materials used in incinerators because of the release of hydrochloride during waste combustion. In this work, the effect of HCl additions (0.05 and 0.1 vol%) to a N2–10CO2–10H2O gas on the oxidation of binary ferritic Fe—(15, 20, 25 and 30 wt%) Cr alloys was investigated at 650 °C. The addition of HCl significantly increased the rate of weight gain during reaction. Thick multi-layered iron-rich oxide scales formed on Fe-15Cr in all gases. Increasing Cr content increased the tendency for Cr2O3 scale formation, leading to complete protection for Fe-25Cr in HCl-free gas, but a level of 30Cr was required in the presence of HCl. Mechanisms underlying the effect of chlorine on the critical Cr concentration required for protective chromia formation are explored.
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The authors would like to thank Prof. Dr.-Ing. Michael Schütze, DECHEMA-Forschungsinstitut, for valuable discussion and final manuscript checking. Financial support by Australian Research Council under the Discovery Scheme is highly acknowledged.
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Aye, K.K., Zhang, J. & Young, D.J. Effect of Hydrogen Chloride on Corrosion Behaviour of Fe–Cr Alloys in Wet CO2 Gas at 650 °C. Oxid Met 94, 51–80 (2020). https://doi.org/10.1007/s11085-020-09978-3
- Chlorine-induced corrosion
- Fe–Cr alloys
- High temperature
- Active oxidation
- Quasi-stability diagram