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Chromate testing for zinc plate

2003

Our parts are plated to ASTM B633 [affil. link] , Type III, SC2. I'm looking for a quick way to verify they have adequate chromate on them, without going all the way through a salt spray test. I've heard there is a lead acetate test, but can't find one. Any help?

Jon Perdue
- San Jose, California, USA

2003

Use 50 g/li of Lead Acetate pH 7.7 put a drop on chromated and non-chromated coating , and find the difference of time that a black stain appears. I think the method appear in spec. ISO/TC 107.

Good luck,

Moshe Graff
CONSULTING - ISRAEL

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