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• CHROMATE CONVERSION COATING
MIL-C-5541F - Chemical Conversion Coatings on Aluminum and Aluminum Alloys
Chromate conversion coatings are created through a passivation process. This
method renders the coated surface structure chemically inactive. A complex metalchrome
molecule film then forms around the metal, which eventually forms into a
continuous gelatinous coating. This type of gelatinous coating effectively eliminates
the chemical reaction process, which is what causes corrosion. Chromate
conversion coatings provide continuous corrosion protection to the metal on which
it is applied.
Chromate conversion films are used for corrosion resistance and a paint base.
When electrical conductivity and corrosion resistance are both required, this
chemical film is a great choice. The coating comes in both iridescent yellow and
clear colors; however, it should be noted that the yellow gives superior corrosion
resistance. The lighter color gives lower electrical resistance. It should also be
noted that chemical film is fragile directly after processing and a 24-hour waiting
time before handling the parts is preferable.
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