is a process of finishing on aluminium in which the visual appearance
of the metal is changed to be aesthetically pleasing. This visual appearance
must have durability, particularly for exterior use.
choice of finish and indeed the choice of finisher will affect the aesthetics
and particularly the durability.
finishes and different finishers will influence the risk element of the
particular product in use and it is this risk element which must be carefully
assessed when choosing from the alternatives.
to aluminium anodising is an electrochemical process, which converts
the surface of the metal into its oxide.
The oxide film is grown by immersing the aluminium in a bath of dilute
sulphuric acid and passing a current of approximately 150 amps per square
metre (at approximately 20 volts) between the aluminium (the anode)
and the cathode.
film produced is porous, hard, transparent and can be coloured in