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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 .
As electropolishing can also be used to sterilize workpieces, the process plays an essential role in the food, medical, and pharmaceutical industries. [5] It is commonly used in the post-production of large metal pieces such as those used in drums of washing machines, bodies of ocean vessels and aircraft, and automobiles.
Anodizing aluminum has been widely used since early last century for corrosion protection and decorative purposes. The porous nature of anodic alumina films was discovered in the 1930s [1] and further elaborated in the 1950s–1970s.
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.
The most common conversion coating processes for metal parts with industrial use include Chromate (aluminum, steel) Phosphate (steel) Bluing (steel) Black oxide (steel) Anodizing (aluminum) Stannate (magnesium) [5] Molybdate (zinc, zinc-nickel) [6] [7] Zirconate (steel, aluminum, magnesium, galvanized steel). [1] [8] [9] Titanate (steel ...
With technological advancement deposits up to .025" have been achieved and retained uniformity. Disadvantages compared to tank plating can include greater operator involvement (tank plating can frequently be done with minimal attention and the solutions used are often toxic), and the inconsistency in achieving as great a plate thickness.
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anodizing – electrolytic passivation process used to increase the thickness of the natural oxide layer, producing a porous surface which can accept organic or inorganic dyes easily. In the case of titanium, niobium, and stainless steel, the colour formed is dependent on the thickness of the oxide (which is determined by the anodizing voltage).
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