Auger analysis of the anodic oxide film on iron in neutral solution

M. Seo, M. Sato, J. B. Lumsden, R. W. Staehle

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The composition depth-profile of anodic oxide films on iron at various potentials in a boric acid-sodium borate solution of pH 8.4 was measured by the sequential use of Auger electron spectroscopy (AES) and sputter-etching. It was found that the anodic oxide film consisted mainly of oxygen and iron with minor impurities such as boron, sulphur and carbon. The composition ratio of boron or sulphur to oxygen exhibited a maximum value at a certain depth in the outer layer of the film and the maximum value of ( B O) increased with increasing potential up to 500 mV (SCE). The film formation mechanism is discussed from the observed dependence of boron content in the film.

Original languageEnglish (US)
Pages (from-to)209-217
Number of pages9
JournalCorrosion Science
Issue number3
StatePublished - 1977

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