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Galvanostatic formation of barrier-type Anodic oxides

✍ Scribed by Prof. Dr. I. A. Ammar; S. Darwish; M. W. Khalil

Publisher: John Wiley and Sons
Year: 1981
Tongue: English
Weight: 739 KB
Volume: 12
Category: Article
ISSN: 0933-5137
DOI: 10.1002/mawe.19810120904

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✦ Synopsis

Abstract

Experimental Factors Affecting Oxide Growth

Results of galvanostatic anodization of various metals with varying valve‐metal behaviour including Nb, Ta, Zr, Ti, Al, W, Te, Sb, and Bi are compiled and compared with respect to the effect of various experimental factors such as surface pretreatment, stirring, solution composition, temperature of the bath, on the efficiency of oxide growth relative to that for other anodic processes. It is concluded that all of the above factors play an important role in the anodization of the non‐typical valve metals, particularly Sb, Bi and W. Typical anodic charging curves associated with the process of oxide growth are given for several valve metals. Experimental data relevant to the phenomena of oxide breakdown are recorded and compared. The results indicate that the mechanism of breakdown varies for the same metal with variations in the experimental conditions.

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