Abstract
Moist air containing HCl gas caused the oxide formed on a Ni-Cr-Al alloy at 850°C to crack during the early stages of growth, and extensive blistering and spalling occurred on cooling. In dry air containing HCl gas no oxide cracking was observed at temperature although the oxide blistered and spalled on cooling. In dry or moist air free from HCl an adherent protective oxide formed which did not spall on cooling. The oxide cracking at temperature has been attributed to the production of hydrogen by reaction of Cr and Al in the alloy with water vapor and the removal of NiO as NiCl2 by reaction with HCl gas. Hydrogen produced by reaction of water vapor or HCl with Cr or Al dissolved in the alloy at temperature, but on cooling the hydrogen was released, causing the oxide to blister and spall. Preoxidation of the alloy in HCl-free atmospheres eliminated these effects of HCl gas in short-term isothermal tests.
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Sandwich course student at Surrey University.
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Hossain, M.K., Noke, A.C. & Saunders, S.R.J. Oxidation of a Ni-Cr-Al alloy at 850°C in air containing HCl gas. Oxid Met 12, 451–471 (1978). https://doi.org/10.1007/BF00612090
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DOI: https://doi.org/10.1007/BF00612090