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Evaluation of High Temperature Corrosion in Simulated Waste Incinerator Environments

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Abstract

In this study, high temperature reactions of Fe–Cr alloys at 500 and 600 °C were investigated using an atmosphere of N2–O2 8 vol% with 220 vppm HCl, 360 vppm H2O and 200 vppm SO2; moreover the following aggressive salts were placed in the inlet: KCl and ZnCl2. The salts were placed in the inlet to promote corrosion and increase the chemical reaction. These salts were applied to the alloys via discontinuous exposures. The corrosion products were characterized using thermo-gravimetric analysis, scanning electron microscopy and X-ray diffraction.The species identified in the corrosion products were: Cr2O3, Cr2O (Fe0.6Cr0.4)2O3, K2CrO4, (Cr, Fe)2O3, Fe–Cr, KCl, ZnCl2, FeOOH, σ-FeCrMo and Fe2O3. The presence of Mo, Al and Si was not significant and there was no evidence of chemical reaction of these elements. The most active elements were the Fe and Cr in the metal base. The Cr presence was beneficial against corrosion; this element decelerated the corrosion process due to the formation of protective oxide scales over the surfaces exposed at 500 °C and even more notable at 600 °C; as it was observed in the thermo-gravimetric analysis increasing mass loss. The steel with the best performance was alloy Fe9Cr3AlSi3Mo, due to the effect of the protective oxides inclusive in presence of the aggressive salts.

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Acknowledgments

The present authors wish to express gratitude to their institutions: Instituto Politécnico Nacional (IPN), Instituto Tecnológico Autónomo de México (ITAM), Consejo Nacional de Ciencia y Tecnología (CONACyT) for technical and assisted support.

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Authors and Affiliations

  1. Department of Engineering in Metallurgy and Materials, Instituto Politecnico Nacional (ESIQIE-IPN), CP 07738, Mexico City, Mexico

    J. A. Alcántara-Cárdenas, J. F. Chávez-Alcalá & M. Sanchez-Pastén

  2. Department of Industrial Engineering, Instituto Tecnologico Autonomo de Mexico (ITAM), CP 01080, Mexico City, Mexico

    J. A. Alcántara-Cárdenas & A. Ramirez-Lopez

Authors
  1. J. A. Alcántara-Cárdenas
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  2. A. Ramirez-Lopez
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  3. J. F. Chávez-Alcalá
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  4. M. Sanchez-Pastén
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Correspondence to J. A. Alcántara-Cárdenas or A. Ramirez-Lopez.

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Alcántara-Cárdenas, J.A., Ramirez-Lopez, A., Chávez-Alcalá, J.F. et al. Evaluation of High Temperature Corrosion in Simulated Waste Incinerator Environments. Oxid Met 85, 611–627 (2016). https://doi.org/10.1007/s11085-016-9615-2

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  • DOI: https://doi.org/10.1007/s11085-016-9615-2

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