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Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called anodizing because the part to be treated forms the anode electrode of an electrolytic cell .
Top-view scanning electron microscopy image of AAO . Anodic aluminum oxide, anodic aluminum oxide (AAO), or anodic alumina is a self-organized form of aluminum oxide that has a honeycomb-like structure formed by high density arrays of uniform and parallel pores.
The thickness and properties of this oxide layer can be enhanced using a process called anodising. A number of alloys , such as aluminium bronzes , exploit this property by including a proportion of aluminium in the alloy to enhance corrosion resistance.
Anodizing is an electrolytic process that forms a thicker oxide layer. The anodic coating consists of hydrated aluminium oxide and is considered resistant to corrosion and abrasion. [ 19 ] This finish is more robust than the other processes and also provides electrical insulation , which the other two processes may not.
AA 6063 is an aluminium alloy, with magnesium and silicon as the alloying elements. The standard controlling its composition is maintained by The Aluminum Association.It has generally good mechanical properties and is heat treatable and weldable.
Anodizing [ edit ] For AA 5083 alloy, the stages of porous structure development are substantially identical with that of pure aluminium, although an increase in oxide growth rate and high conductance of the oxide film were observed.
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Anodizing also makes the surface non-conducting, so that its surface will charge up in electrostatic systems. The best treatment is Alochroming, which seals the surface, makes it hard and conductive. Its outgassing rate is considerably less than non-treated aluminium.