Comment on 'Oxidation of Alloys Containing Aluminum and Diffusion in Al2O3' [J. Appl. Phys., 95, 3217, 2004]
- ORNL
- Lehigh University, Bethlehem, PA
Three problems have been identified with this recently published paper: (1) The author claims that alumina scales do not satisfy the conditions necessary to apply the Wagner oxidation theory. Reassessment of several of the author's proposed nine criteria indicates that Wagner's theory does apply. (2) The author repeatedly mentions a lack of correlation between oxidation rates and diffusion rates and their different activation energies. It is shown that reasonable oxidation rates can be calculated from the extrapolated grain-boundary diffusion relationships. (3) The author proposes a mechanism for the growth of alumina scales involving the transport of a neutral AlO species. This mechanism is inconsistent with repeated experimental results indicating that the growth of alumina scales is by charged species and that the alumina growth rate can be altered by an applied current.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- FE USDOE - Office of Fossil Energy (FE)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 930688
- Journal Information:
- Journal of Applied Physics, Vol. 97, Issue 11; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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