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In the chromate conversion process, the metal surface of a part
is converted to a superficial layer containing a complex mixture
of chromium compounds. The chromate film is soft when freshly formed,
but once dried and aged, the film becomes more abrasive resistant.
Chromate conversion coatings provide excellent corrosion resistance.
Paint, lacquer, and organic finishes bond exceedingly well to chromate
conversion coatings. In addition, the chromate coatings prevent
loss of pain adhesion due to underfilm corrosion.
Chromate conversion films vary in color depending on the chemical
being used and the base metal being coated. Colors range from clear,
to light iridescent, to gold. Greater corrosion protection is provided
with formulations that give a golden color, as these coatings tend
to be thicker. A variegated appearance may be obtained when the
base metal is non-uniform (i.e., welds in wrought materials and
castings).
We use Alodine® and Iridite® brands of chromium conversion
coating chemicals, and we can provide clear and gold coatings. Castings
are one of our specialties, and military certification is available
on request.
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