Anodized thin film samples of single phase nickel 13 w/o (weight percent) molybdenum have been analyzed by scanning transmission electron microscopy using a variety of examination modes. It is established that the anodic film comprises a fine mosaic of almost epitaxial crystalline nickel oxide particles of 3 nm diameter. Characteristic X-ray analysis suggests that molybdenum is concentrated in the surface of anodized samples, but there is no electron diffraction evidence for a crystalline molybdenum oxide. It is suggested that molybdenum is present in the anodic film as either a finely dispersed or an amorphous oxide or as a hydrated phase. A model of the anodized films leads to an explanation of the effects of molybdenum alloying additions on the electrochemical characteristics of single phase nickel-molybdenum alloys.
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Moriya et al. (1984) studied this question.
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