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-----Trivalent vs. Hexavalent Coatings on Zinc Plating
2007
I'm working at a competitive furniture company as Quality Engineer (In-coming).
I want to know the easiest way to differentiate between zinc-plating part trivalent and hexavalent.Other than we do some detail inspection that need certain time to get the result, can it be confirmed visually?If can, please explain to me.
There is a possibility for me to overlook the trivalent and hexavalent condition when it comes to small part like screws, nuts, etc.
Engineer - Kuala Lumpur, Malaysia
2007
As far as I know, you cannot just look at the part and tell the two apart. There may be some sophisticated instrumental method I am not familiar with.
This question has come up before on the board. A sample of the lot of parts needs to be leached to remove the conversion coating, and the leachate tested for hexchrome with a colorimetric test.
Dave Wichern
Consultant - The Bronx, New York
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