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Letter 32072
Trivalent yellow chromate in place of
yellow dichromate
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Hi, everyone. I have a question regarding to an application we
specify "Coating of zinc on steel with yellow dichromate conversion
coating". Our supplier is offering something he describes as
"Trivalent yellow chromate". I understand, both specifications are
different in spite of both are yellow color. Coating we request is
used to protect steel parts intended to conduct electrical current.
Our spec requires parts, after coating, must be able support a
Salt spray test as per ASTM B 117.
May we use Trivalent yellow chromate in place of yellow
dichromate?
David Vazquez
Siemens E & A - El paso, TX, US
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