Abstract
Low pressure oxidation studies of Ni-18%Cr alloy were carried out at temperatures of 500–600°C for very brief periods. Detailed XPS, AES, SEM, and TEM studies identified four stages in the initial oxidation. These are: (1) formation of a mixed nickel-chromium oxide overlayer; (2) growth of submicron-sized oxide nodules; (3) development of dark “hole-like” patches on the surface; and (4) growth of “second generation” oxide nodules. Both types of nodules consist primarily of a nickel structure depleted in oxygen. Their formation appears to result from a very rapid outward movement of nickel from localized defects in the metal. The dark patches result from the presence of a chromium oxide-rich underlayer, which appears to form by a lateral migration of chromium from adjacent oxide/metal interface regions and from grain boundaries.
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McIntyre, N.S., Chan, T.C. & Chen, C. Characterization of oxide structures formed on nickel-chromium alloy during low pressure oxidation at 500–600°C. Oxid Met 33, 457–479 (1990). https://doi.org/10.1007/BF00666809
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DOI: https://doi.org/10.1007/BF00666809