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52040
True definition of "Bronze" chromate color
for zinc plating
May 1, 2009
Hi! I work for a distributor for hardware and we occasionally
outsource plating operations when instructed by a design or
engineering standard.
One drawing in particular states that a specific screw should be
plated per 1.9.2.3 of MIL-STD-271 (ASTM-B633, Ty II, Class 3) except
.0003 thich and chromate treatment to be bronze or olive drab in
color.
We historically apply the olive drab chromate, but recently received
a lot back with what we would call yellow chromate. A similar
specification for cadmium states the chromate can range in color from
bronze to brown, including yellow, olive drab and forest green. I
find no reference to actual colors and definitive color ranges in the
Zinc specification.
Is yellow chromate the same as bronze chromate and the terminology
simply semantics?? Any input is greatly appreciated. I am currently
trying to disposition this lot for acceptance or rejection.
Thanks so much!
Loretta Young \O/
Loretta Young
Plating shop customer - Palestine, TX, USA

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