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Machining before chromate conversion coating

A customer wants a Chemical Conversion Coating, Coat Per AMSC5541, Class 3. This is to be applied on 6061 T6. What machined surface finish should this part be machined to?

Jeff Curley
Machining - Delia, KS, USA
2007

I does not matter; however, note that work hardened area will have a slightly different color.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2007

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