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| THE VARIATION ROLE OF ION MIGRATION DURING ANODIC FILM GROWTH ON ALUMINIUM AND ITS EFFECT ON FILM MORPHOLOGY |
| Xu Yuan (Beijing University of Iron and Steel Technology)Thompson;G.E Wood;G.C.(Corrosion and Protection Center;UMIST) |
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Abstract The variation role of ion transport number during the growth of anodic films on aluminium and its effect on film morphology have been studied by using TEM allied with ultramicrotomy sectioning,marker technique and quantitative chemical analyses by ICP-AES.The results show that athe alumin- ium and oxygen-containing ions migrate in opposite directions through the film.In a particular electrolyte,the real transport number of aluminium ions is a constant.When the applied anodic current density exceeds a critical value,a fraction of the aluminium ions acts as film material at the film- electrolyte interface in the form of barrier film.On the other hand,when the applied anodic current density is less than the critical value,all the outwardly migrating aluminium ions enter into the electrolyte and hence the film is entirely formed by oxygen-containing inos at the film-metal interface. The film formed under this condition is porous due to attack of the electrolyte on the outer film surface.Mathematic expressions of film growth efficiency and the relationship between apparent and real transport numbers have been derived.The process of film material formation by aluminium ions at the film-electrolyte interface is explained by a direct dissolution-precipitation theory.
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Received: 25 February 1988
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Cite this article:
Xu Yuan (Beijing University of Iron and Steel Technology)Thompson;G.E Wood;G.C.(Corrosion and Protection Center;UMIST). THE VARIATION ROLE OF ION MIGRATION DURING ANODIC FILM GROWTH ON ALUMINIUM AND ITS EFFECT ON FILM MORPHOLOGY. J Chin Soc Corr Pro, 1988, 8(1): 1-14.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1988/V8/I1/1
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