Abstract
Wagner and Levin1 have recently shown that metallic copper separates within the oxide scale formed on a 68/32 cupro-nickel alloy at 850° C. They considered that this was due to a reduction of cuprous oxide by nickel diffusing outward from the parent alloy. In some recent experiments, designed to investigate the oxidation characteristics of a range of cupro-nickel alloys in high-pressure steam, the authors have observed bands of copper in oxide scales formed on specimens oxidized at 275° C. It is our opinion that, at this low temperature, diffusion processes alone could not account for the isolation of such large masses of copper (Fig. 1).
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References
Levin, R. L., and Wagner, jun., J. B., J. Electrochem. Soc., 108, 954 (1961).
Masterson, H. G., and Evans, G. E., Proc. First Intern. Cong. Metallic Corrosion, London (1961).
Blade, J. C., and Preece, A., J. Inst. Met., 88, 427 (1960).
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CASTLE, J., HARRISON, J. & MASTERSON, H. Oxidation of Cupro-Nickel Alloys in Steam–Oxygen Mixtures. Nature 196, 261–262 (1962). https://doi.org/10.1038/196261a0
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DOI: https://doi.org/10.1038/196261a0
