Letter 28042

Need Dacromet without chrome-6  

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We currently use Dacromet coating on socket screws and large bolts. Our customer has asked that we change from Dacromet to a non hexavalent (?) finish. We need to retain all the other qualities of Dacromet, eg, Saltspray resistance, suitability for threaded components etc.

Please advise a suitable treatment.

John McCarthy
distributor - Bristol, United Kingdom

The manufacturer of Dacromet, Metal Coatings International, offers a chrome-free system called Geomet. I cannot say whether or not all of the qualities of Dacromet are fully maintained, but that was the intention.

Ted Mooney, P.E.  finishing.com Brick, New Jersey

Answer or follow-up on this subject (in non-commercial fashion).

 

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