| Chemical
Film ( chem film) coatings are gelateneous films which provide some sort
of a barrier medium to retard corrosion on aluminum surfaces and enhance
adhesion of subsequent coatings such as paints and primers. Materials qualified
produce coatings that range in color from clear to iridescent yellow or
brown; are electrically conductive; and impart some measure of corrosion
protection. Inspection difficulties may arise with clear coatings because
visual inspection does not always reveal the presence of a break in the
coating.
Applications include: anodized components
(where specific surfaces require electrical conductivity); aluminum stampings;
electronic components. |
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Chemical Films |
[MIL-C-5541E]
Class 1A: Chemical conversion coatings
are intended to provide corrosion prevention when left unpainted as well
as to improve adhesion of paint finish systems on aluminum and aluminum
alloys. May be used on tanks, tubing, and component structures where paint
finishes are not required for the exterior surfaces but are required for
the interior surfaces.
Class 3: Chemical conversion
coatings are intended for use as a corrosion preventative film for electrical
and electronic applications where lower resistant contacts, relative to
Class 1A coatings, and anodic coatings in accordance with Mil-A-8625, are
required. The primary difference between a Class 1A and a Class 3 coating
is thickness.
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