Theory of electrical breakdown during formation of barrier anodic films

✍ Scribed by S. Ikonopisov

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 707 KB
• Volume: 22
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(77)80042-x

✦ Synopsis

The anodic formation of barrier oxide films on valve metals cau be carried on till the electrode potential has attained the "breakdown voltage" (Us), after which a sustained sparking appears

The systematization of the available data on this phenomenon revealed that Us depends fundamentally on the nature of the anodized metal, as well as on the composition and resistivity of the elect&W.

Many other factors like the current density, the surface topography of the electrode, the history of the tilm formation, erc do not affect Us noticeably. This phenomenology of the breakdowns, as well as their appearance, was explained by a breakdown model. According to this model, sparking is considered as an avalanching in the bulk of the anodic film, the initial electrons being injected into the film from the electrolyte. The peculiar features of the sparking were found to arise both from the specific injecting behaviour of the electrolyte and from the simultaneous oxide 6lm formation.