Ignition of nickel in environments containing oxygen and chlorine |
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Authors: | Y Y Lee and M J McNallan |
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Affiliation: | (1) Department of Civil Engineering, Mechanics, and Metallurgy, University of Illinois at Chicago, P.O. Box 4348, 60680 Chicago, IL |
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Abstract: | The mixed oxidation of nickel in gases containing both oxygen and chlorine has been investigated using the techniques of thermogravimetric
analysis and examination of the corrosion products by scanning electron microscopy. Two regimes of corrosion behavior have
been detected: one in which a protective oxide film is present and the rate of corrosion is controlled by the transport of
the volatile products of the reaction between the gas phase and the oxide, and one in which the protective film is penetrated
and corrosion occurs rapidly enough to result in the ignition of the specimen. The oxide corrosion products on the specimens
after corrosion have characteristic morphologies, with the products of volatilization type corrosion consisting of large grains
and the products of ignition type attack consisting of fine spherical particles. Ignition is a serious hazard in environments
containing 0.25 pct or more Cl2 and 4 pct or more O2 by volume at temperatures between 1000 K and 1100 K, but is not produced by exposures at higher temperatures. A model based
on the stability of the protective film in steady state corrosion is presented which can be used to predict the transition
from volatilization to ignition type attack. |
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Keywords: | |
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