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Internal Oxidation of Fe–Al Alloys in a KCl-Air Atmosphere at 650°C

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Abstract

The corrison performance of three Fe–Al model alloys (10, 20, 45, at.%Al), was examined at 650° C in air beneath a KCl solid deposit and in the presence of trace KCl vapor. The two low-Al-Content Fe–10Al and Fe–20Al alloys experienced accelerated corrosion yet exhibited similar degradation behavior regardless of the solid or vapor state of KCl. The corrosion products consist of an outermost layer of cracked Fe2O3, overlying an intermediate region of the mixed oxides of Fe and Al. Finally, an aluminum-depleted, internal-oxidation zone was observed. Fe-45Al suffered relatively the least attack by developing a dense alumina surface layer, which was particularly stable in the presence of KCl vapor. However, porous iron oxide could be produced locally on the Fe–45Al surface after breakdown of the passive alumina film beneath the KCl deposit. Consequently, an Al-depleted zone was formed underneath the iron oxide, due to the preferential removal of aluminum from the matrix.

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  1. Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-, Straße 1, D-, 40237, Düsseldorf, Germany; e-mail:

    Y. S. Li & M. Spiegel

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  1. Y. S. Li
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  2. M. Spiegel
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Li, Y.S., Spiegel, M. Internal Oxidation of Fe–Al Alloys in a KCl-Air Atmosphere at 650°C. Oxidation of Metals 61, 303–322 (2004). https://doi.org/10.1023/B:OXID.0000025337.64394.bf

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