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Morphology of corrosion products formed on cobalt and nickel in argon-oxygen-chlorine mixtures at 1000 K
Authors:M. J. McNallan  W. W. Liang  J. M. Oh  C. T. Kang
Affiliation:(1) Department of Materials Engineering, University of Illinois at Chicago Circle, P.O. Box 4348, 60680 Chicago, Illinois;(2) Materials Department, University of Wisconsin-Milwaukee, P.O. Box 784, 53201 Milwaukee, Wisconsin;(3) Present address: Amoco Research Center, P.O. Box 400, 60566 Naperville, Illinois;(4) Present address: Department of Metallurgy and Materials Engineering, University of Pittsburgh, 15261 Pittsburgh, Pennsylvania
Abstract:The morphology of corrosion products formed on cobalt and nickel in argonoxygen-chlorine mixtures at 1000 K have been examined using optical microscopy, scanning electron microscopy, and X-ray diffraction. The corrosion products formed under conditions where the oxides are thermodynamically stable consist of porous oxides containing little or no chlorine. This morphology is consistent with a corrosion mechanism involving vapor phase transport of volatile metal chlorides.
Keywords:Mixed oxidation  chlorine  morphology  cobalt  nickel
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