By V. F. Henley
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Additional info for Anodic Oxidation of Aluminium and its Alloys
However, perfect matching is not commercially feasible and it is therefore worth bearing in mind the possibility of using contrasting finishes for adjacent areas. For example, large areas of curtain wall sheet can either be broken up with other materials such as stone or concrete or by "break strips" in another colour or texture. All articles to be anodized have to be suspended on jigs during treatment and must be provided with adequate electrical contact areas to carry the anodizing current. These areas should be arranged on non-significant surfaces as they have no protective anodic coating on them.
The work which should already have been cleaned is immersed in the Brytal solution for about 30 seconds, during which chemical attack takes place on the aluminium with an evolution of hydrogen. The function of this stage is to ensure a clean uniformly wetted surface. The slight etching effect is removed by the subsequent electrobrightening. However, the electrobrightening treatment time can sometimes be shortened by omitting the initial etching stage —this can only be established by trial. At the end of the etching period the current is switched on and the voltage raised to the operation figure of about 20.
All significant surfaces should face cathodes at roughly similar distances, normally not closer than 15 cm. Hollowed components Hollowed or recessed components should, as far as possible, be face upwards so as to prevent the formation of gas or air pockets. To ensure complete and even film formation on the inside of a hollowed article having a very narrow opening, an auxiliary cathode or cathodes may be suspended near or inside it in a suitable position and internal agitation provided. g. with glass or porcelain beads) from a possible short circuit with the anodic workpiece.