Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций
Год издания: 2007
Ключевые слова: Degradation mechanism, Metals, Nickel alloys, Oxygen-evolving anodes, Corrosion rate, Degradation, Electrochemistry, Metal melting, Porous materials, Degradation mechanisms, Galvanostatic potential, Nickel contents, Ohmic drop, Oxygen-evolving anodes, Nickel alloys
Аннотация: Voltammetric data and galvanostatic potential transients are compared for a wide range of Ni-containing alloys in cryolite melts (CR 1.8, 2.3 and 2.7) with 1 - 8 wt.% alumina. The specific features of alloys depend cruciaUy on the nickel content. For 40 - 75 wt.% Ni alloyed with Fe, Cu and Al two general types of anode degradation are (1) low resistance of solid products and a tendency to internal corrosion resulting in formation of a porous metal layer; (2) high resistance of solid products with pronounced suppression of oxygen evolution and appearance of rather high ohmic drop. The nature of fluorides, oxides and spinels responsible for both types of behavior is reported on the basis of XRD data, and two major formation mechanisms of these products are discussed in the context of predicting the most prospective combinations of alloy and melt compositions for electrolysis with low-consumption metallic anodes.
Журнал: TMS Light Metals
Номера страниц: 489-493