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.
Highlights
In solving problems associated with the electrochemical machining of aluminium alloys, an important role is played by an understanding of the laws of their anodic dissolution in an intensive electrolyte flow
Knowledge of these laws will allow the optimal composition of the electrolyte to be chosen for the best mode for electrochemical machining of aluminium alloys, providing high accuracy and surface quality
In the study of the anodic behaviour of the investigated aluminium alloys depending on the temperature of the solution, the rotating speed of the disk electrode showed that the maximum current density on the anodic polarisation curves increases with a decreasing concentration of sodium chlorate solution from 5M to 3M (Fig. 1), as well as with an increase in electrolyte temperature (Fig. 2) and with an increase in the rotational speed of the disk electrode (Fig. 2)
Summary
The eĝect 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 shiĢ and a venting of the reaction products from the surface of the anode. The eĝective 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 speciĞc oxide Ğlm and inhibition due to the electrochemical heterogeneity of the structural components of the alloys. Институт фундаментального образования Уральский федеральный университет, Россия, 620002, Екатеринбург, ул.
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