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The kinetic aspects of the competitive reaction of CO and H 2 O in the formation of chromia layer on a nickel base alloy at high temperature were studied by thermogravimetry combined to gas phase chromatography. It was shown that competitive adsorption occurred between both molecules and that whatever PCO/PH2O ratio, CO mainly reacted in the first instants of oxidation and H 2 O became...
Corrosion of a chromia-forming nickel base alloy, Haynes 230 ® , has been investigated under impure helium containing a few Pa of CO and H 2 O at 900°C. It has been found that this alloy reacts simultaneously with CO and H 2 O. Oxidation by CO has been revealed to occur mainly in the first hours. CO diffuses through the scale via short-circuit pathways and oxidizes Al, Cr and...
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