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Anodising
Anodising is the process name of coating by anodic treatment. Anodising certain metals, such as aluminium, titanium and magnesium (where the work piece is made into an anode in an electrolytic cell) usually serves as a purpose of increasing the performance of the surface.
In the anodising process (in most cases when
anodising aluminium) the anode forms a layer of aluminium oxide - Al203
which is very hard,
relatively inert,
electrically insulated
and can absorb dyes to achieve a desired colour
for the surface. The anodic film itself grows at the aluminium oxide
interface by the continuous formation and dissolution of a layer of
oxide. This is the so-called barrier layer and its thickness is a
function of the processes starting voltage. A porous, more structured
layer then forms on top of the barrier layer making up the rest of the
coating.
Anodising has a protective and extremely hard deposit. It can also be decorative and coloured by either inorganic metal compounds or organic dyes.
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