Anodic behaviour of aluminium and its alloys in sodium chlorate solutions

Abstract

The effect of chlorate ions on the anodic dissolution of aluminium and its alloys with magnesium under conditions of high current densities and intensive electrolyte mixing is investigated using the method of anodic polarisation curve removal on a rotating disk electrode. It is shown that at relatively low anodic potential values the process is limited by the capacity of the electrochemical reaction, but with a further potential shift and a venting of the reaction products from the surface of the anode. The effective smoothing of the surface microrelief of aluminium alloys in solutions of chlorates is due to the periodic formation and destruction on the treated surface of a specific oxide film and inhibition due to the electrochemical heterogeneity of the structural components of the alloys.