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High Temperature Corrosion of Cast Alloys in Exhaust Environments I-Ductile Cast Irons

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Abstract

The oxidation behavior of two ductile cast irons was investigated in synthetic diesel and gasoline exhaust gases. The alloys were a SiMo (Fe3.86Si0.6Mo3C) and a Ni-Resist (Fe32Ni5.3Si2.1C). Polished sections were exposed at temperatures between 650 and 1,050 °C, mostly for 50 h. The oxidation product was characterized by means of SEM/EDX, AES, XPS and XRD. Iron oxides nodules formed above a continuous layer of Fe–Si-oxide for SiMo. The alloy failed in forming a continuous silica layer at low temperatures. At 850 °C and above silica was formed, but austenite formation enhanced the decarburization. Escaping CO/CO2 increased the oxide porosity, and consequently the oxidation rate. The oxidation resistance of Ni-Resist was dependent on Cr assisting the formation of SiO2. However, this effect was restrained to cell boundaries in particular when water enhanced the Cr evaporation or the diffusion was slow at low temperatures. Then, the rapid oxidation left metallic Ni particles in the inner oxide.

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Acknowledgments

This work was done within the Swedish competence centre for High Temperature Corrosion. The authors acknowledge Volvo Truck Corporation for financial support and in particular U. Boman for valuable co-operation. Synthetic exhaust gas exposures were done at Volvo Technology Corporation.

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  1. F. Tholence

    Present address: ABB AB, Corporate Research, 721 78, Västerås, Sweden

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  1. Department of Materials and Manufacturing Technology, Chalmers University of Technology, 412 96, Gothenburg, Sweden

    F. Tholence & M. Norell

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  1. F. Tholence
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Correspondence to M. Norell.

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Tholence, F., Norell, M. High Temperature Corrosion of Cast Alloys in Exhaust Environments I-Ductile Cast Irons. Oxid Met 69, 13–36 (2008). https://doi.org/10.1007/s11085-007-9081-y

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