Anodizing for aluminum
Anodizing, is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. Anodizing increases corrosion resistance and wear resistance, and provides better adhesion for paint primers and glues than does bare metal. Anodic films can also be used for a number of cosmetic effects, either with thick porous coatings that can absorb dyes or with thin transparent coatings that add interference effects to reflected light.

A common usage on anodizing is Dyeing. Produce a porous surface which can accept dyes easily.

The number of dye colors is almost endless; however, the colors produced tend to vary according to the base alloy. Black dyes and gold produced by inorganic means (ferric ammonium oxalate) are more lightfast. Dyed anodizing is usually sealed to reduce or eliminate dye bleed out.

  
  Anodizing solution can 
  be applied on the casing 
  in a wide range of 
  products