https://www.fastenerdata.co.uk/chromium-chrome-trivalent-hexavalent-cr6-cr3-directive
Fastenerdata - Chromate Passivation 16f90 - Fastener Specifications
Fastener chromate passivation and the effect on fastener coatings both in Cr3 and Cr6 are detailed in this article that shows legislation and the Cr+6 and Cr3...
chromate passivationfastenerdataspecifications