✦ LIBER ✦

An approach to the mechanism of Corrosion of tungsten in alkaline solutions

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

Publisher: John Wiley and Sons
Year: 1982
Tongue: English
Weight: 453 KB
Volume: 13
Category: Article
ISSN: 0933-5137
DOI: 10.1002/mawe.19820130503

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✦ Synopsis

Abstract

The mechanism of anodic dissolution and hence of corrosion of W in alkaline solutions (NaOH, Na~3~PO~4~) has been investigated by measuring anodic Tafel lines by the galvanostatic technique, and calculating both the Tafel slope b and the effect of pH on anode potential as diagnostic criteria for the mechanism. The quasi‐equilibrium principle of Kabanov, Burstein and Frumkin for all reactions preceding the rate‐determining (rd) step has been used to calculate the concentration of intermediates as a function of potential. Two mechanisms have been tested with this principle:

the first involving the formation and dissolution of nonstoichiometric and stoichiometric surface oxides, and

the second deals with the formation and dissolution of hydroxide species.

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