Anodizing
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Anodizing, or Anodising, is used to increase the thickness of the natural oxide layer, on the surface of metal parts. Anodizing is often used with aluminum, though processes exist for anodizing titanium, zinc, magnesium etc. Anodizing is not useful for iron or carbon steel, because these metals flake when oxidized (rust and flake) constantly exposing the underlying metal to corrosion.

Production

The process is called "Anodizing," because the treated part becomes the anode electrode in an electrical circuit. Metal is anodized to increase surface hardness, improve corrosion, and wear resistance. Anodizing allow's better adhesion than plain metal, for paint primers and glues.