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Influence of Cr and Ni on High-Temperature Corrosion Behavior of Ferritic Ductile Cast Iron in Air and Exhaust Gases

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Abstract

Due to an expected temperature increase of the exhaust gases in heavy-duty engines in order to meet future emission regulations, there is a need to develop materials that can operate at higher temperatures. The exhaust manifold in the hot end of the exhaust system is specifically affected since the most common material today, SiMo51, is already operating close to its limits. Accordingly, the effects of Cr and Ni-additions on the high-temperature corrosion resistance of this material in air and exhaust gases were examined. It was found that the addition of 0.5 and 1 wt% Cr improved the oxidation resistance in air at 700 and 800 °C by the formation of an SiO2 barrier layer as well as a Cr-oxide at the oxide/metal interface. However, no Cr-oxide was detected after exposure to exhaust gases, probably due to a water vapor-assisted evaporation of Cr from the oxide. The addition of 1 wt% Ni resulted in a deteriorated SiO2 barrier layer and reduced oxidation resistance.

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Acknowledgments

This work was done within The Department of Materials Science and Engineering and the Department of Chemical Science and Engineering at the Royal Institute of Technology, KTH in co-operation with Scania CV AB. The authors acknowledge Vinnova for financial support. The oxidation tests in exhaust gases were performed at Scania CV AB and the authors are grateful to J. Boman for valuable support. The authors also thank Dr. P. Hedström, KTH for running the EBSD-analysis and the technicians at Materials Technology, Scania CV AB for support of sample preparation.

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Authors and Affiliations

  1. Division of Mechanical Metallurgy, Materials Science and Engineering, Royal Institute of Technology, 100 44, Stockholm, Sweden

    M. Ekström & S. Jonsson

  2. Division of Surface and Corrosion Science, Chemical Science and Engineering, Royal Institute of Technology, 100 44, Stockholm, Sweden

    P. Szakalos

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  1. M. Ekström
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  2. P. Szakalos
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  3. S. Jonsson
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Correspondence to M. Ekström.

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Ekström, M., Szakalos, P. & Jonsson, S. Influence of Cr and Ni on High-Temperature Corrosion Behavior of Ferritic Ductile Cast Iron in Air and Exhaust Gases. Oxid Met 80, 455–466 (2013). https://doi.org/10.1007/s11085-013-9389-8

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