ENHANCED PASSIVITY OF GUILLOTINED ALUMINIUM IN Na_2SiO_3 SOLUTION BY GEL FORMATION

Abstract

Abstract: The passivity of guillotined aluminium electrode is enhanced in alkaline electrolytes by SiO32-. It is proposed that the formation of a complete aluminosilicate gel is responsible for this phenomenon. Dissolution of the metal proceeds via the existing film and the dissolution product reacts with SiO_3~2- ions to form the gel. Under galvanostatic polarisation, significant amount of the gel is formed when the applied anodic i > 10mA cm-2. This gel layer can then be transformed into barrier-type of oxide film, thus contributing to the initial stage of the high voltage anodisation.

Key words: passivity, repassivation, guillotined aluminium, silicate, dissolution

C. Liu and G.T. Burstein (Department of MateriaIs Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom). ENHANCED PASSIVITY OF GUILLOTINED ALUMINIUM IN Na_2SiO_3 SOLUTION BY GEL FORMATION[J]. Acta Metallurgica Sinica (English Letters), 1997, 10(1): 1-9.

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ENHANCED PASSIVITY OF GUILLOTINED ALUMINIUM IN Na_2SiO_3 SOLUTION BY GEL FORMATION

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