THE INFLUENCE OF ION IMPLANTATION ON THE DEVELOPMENT OF Cr2O3 SCALES ON Ni-20% Cr AT HIGH TEMPERATURE

Stott, F.H.; Punni, J. S.; Wood, G. C.; Dearnaley, G.

doi:10.1016/b978-0-08-027625-0.50031-9

Cited by 5 publications

(2 citation statements)

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“…Examination of the morphologies and compositions of the scales developed on a Ni-20% Cr alloy ( Fig. 2a) has shown that the protective Crz03 layer forms more rapidly over alloy grain boundaries than over alloy grains (Stott et al, 1982a), consistent with a more rapid diffusion rate of chromium to the surface via alloy grain boundaries than through the alloy lattice. Relatively large, nodular grains of NiO can be observed over the alloy grains.…”

Section: Development Of Protective Cr203 Scales At High Temperaturementioning

confidence: 93%

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Some recent experience with the scanning electron microscope in corrosion research

Stott

1984

Journal of Microscopy

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Corrosion and oxidation are the results of chemical reaction between a solid surface (such as of a metal or alloy) and its environment, to form a corrosion product. The product may adhere to the surface, thereby usually providing some protection from further attack, or may be removed from it (e.g. by volatilization or by dissolution in the environment). In either case this leads to changes in topography, morphology and, often, composition of the surface. Study of such changes can provide considerable information and assistance in the determination of the mechanisms of degradation. Scanning electron microscopy with associated microanalysis has thus enabled significant advances to be made in understanding many corrosion and oxidation processes. The progress attained in several areas where the technique has played a major part but has been extended to its maximum capabilities is discussed and related to the particular advantages and limitations of scanning electron microscopy in this field. One such area is the study of high-temperature corrosion processes. Here, the high resolution and depth of focus of the instrument have provided detailed information on the microstructure of high-temperature oxide and other corrosion-product scales and underlying alloy. For instance, the sizes and distributions of pores in the scales give important insight into the possibility of growth mechanisms involving gas-phase transport within the scales themselves. Associated microanalysis can assist in identification of rate-determining layers and of other localized diffusion paths which can short-circuit bulk lattice diffusion. 0 1984 The Royal Microscopical Society 13 191 194 F. H. Stott

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Section: Development Of Protective Cr203 Scales At High Temperaturementioning

confidence: 93%

“…These analyses confirm the electron diffraction data which show that the precipitates are Crz03 for Ni-Cr alloys. However, for the Ni-A1 alloys, they are NiA1204 near the surface but A1203 near the internal oxide /alloy interface Stott et al, 1982a).…”

Section: High Temperature Internal Oxidation Processesmentioning

confidence: 97%