Experimental Study And Modelling Of Heat
Transfer During Anodizing In A Wall-jet Set-up
Author(s)
T. Aerts, G. Nelissen, J. Deconinck, I. De Graeve & H. Terryn
Abstract
The anodizing of aluminium is an electrochemical surface treatment yielding the
formation of an alumina film, the characteristics of the formed oxide strongly
depending on the considered anodizing conditions. Heat transfer has an
important influence on the anodizing process, which can be explained by
considering the production of heat near the aluminium anode, combined with the
significant influence of the local electrode temperature on the process of oxide
formation. The influences of temperature and heat transfer on the growth of the
anodic oxide film during anodizing of high purity Al are studied on a laboratory
scale in a wall-jet electrode reactor. The impinging jet configuration of the
reactor creates a non-uniformly accessible electrode with variable convection as
a function of the radial position on the anode. The influence of the resulting
non-uniform heat transfer on the local temperature of the electrode is monitored
by local temperature measurements on the backside of the aluminium anode,
whereas its influence on local film growth is evaluated by means of FEG-SEM
surface and cross sectional analyses. A comparison between the simulated and
experimentally acquired data is presented. The controlled and known electrolyte
flow in the wall-jet reactor enable numerical simulations of the convection which
supply additional information on the encountered conditions of heat transfer. The
anodizing process itself is simulated using a model based on the high field
theory.
Keywords: aluminium, anodizing, heat transfer, wall-jet reactor, modelling.
Keywords
aluminium, anodizing, heat transfer, wall-jet reactor, modelling.
Related Book
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