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Manufacturing:
Surface Finishing
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Surface
Finishing Coatings
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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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