High Temperature Corrosion of M-40Cr-0.5Ce Alloys as Inert Anodes in Aluminium Electrolysis

Abstract:

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Fe-40Cr-0.5Ce and Ni-40Cr-0.5Ce alloys prepared by vacuum melting have been studied as inert anodes in aluminium electrolysis. High temperature corrosion of these alloy anodes was conducted in cryolite-alumina electrolytes at anodic current density of 0.5 A/cm2, at 800°C and 900°C for 10h respectively. It is found that a Cr2O3 scale was selectively formed on the surface of Ni-40Cr-0.5Ce anode at 900°C, corresponding to excellent corrosion resistance during aluminium electrolysis and higher purity of aluminium product. While a composite oxide film was developed on the surface of Fe-40Cr-0.5Ce anode at 800°C. The formation of Cr2O3 scale is controlled by both of the dissolving rate of Cr2O3 scale in electrolyte and the diffusing rate of Cr in alloys, so the M-Cr alloys require a high content of Cr for inert anodes application.

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Periodical:

Edited by:

Toshio Maruyama, Masayuki Yoshiba, Kazuya Kurokawa, Yuuzou Kawahara and Nobuo Otsuka

Pages:

254-259

DOI:

10.4028/www.scientific.net/MSF.696.254

Citation:

Y. P. Zhu et al., "High Temperature Corrosion of M-40Cr-0.5Ce Alloys as Inert Anodes in Aluminium Electrolysis", Materials Science Forum, Vol. 696, pp. 254-259, 2011

Online since:

September 2011

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$35.00

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