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Manufacturing Processes - Conversion Coating - Surface Finishing

 

Manufacturing: Surface Finishing


Finish Machining

Surface Finishing Coatings

Conversion Coating

Conversion coating is a metal finishing process which involves the application of a coating (e.g., by spray or dip tank) to a base metal to increase corrosion protection and to prepare the surface for additional coatings, or the formulation of a special surface appearance. Conversion coatings include chromating, phosphating, metal coloring and/or immersion plating.

Chemical conversion coatings are deposited on aluminum by different methods such as dipping, spraying or roll coating. The purpose is to form a continuous film, normally an oxide, which provides a good base for painting and adhesive bonding.

Desirable properties of the conversion coatings are:

  • Ability to form physical and chemical bonds to paints and adhesives
  • Good resistance against hydration
  • High stability over a wide pH range
  • Corrosion protection of the substrate

 

 

 

 




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