Process difference between Cr6 vs Cr3 plating
Process difference between Cr6 vs Cr3 plating
(OP)
I am trying to do an investigation between the two processes as a costing excercise is there any one out there who can give me a breakdown of the two processes? What is the difference in equipment and products used to perform each method of chrome plating...





RE: Process difference between Cr6 vs Cr3 plating
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Process difference between Cr6 vs Cr3 plating
Thanks for the feedback, if there is essentially no difference in process, then how is it that the Cr3 is more expensive?
RE: Process difference between Cr6 vs Cr3 plating
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Process difference between Cr6 vs Cr3 plating
RE: Process difference between Cr6 vs Cr3 plating
RE: Process difference between Cr6 vs Cr3 plating
RE: Process difference between Cr6 vs Cr3 plating
RE: Process difference between Cr6 vs Cr3 plating
The basic process is the same but there are different details. Because tri is a lower performance material you have to do other things to restore the performance to where it was with hex. If it is a decorative part you similar problems. That is one of the reasons tri never replaced hex in the past.
There is "essentially no difference in process" between Budwiser and Guiness. Why does one cost more?
RE: Process difference between Cr6 vs Cr3 plating
Let me use an example. Externally threaded fasteners (screws) used for automobile production, approximately 1 million pieces per year. After forming the screw, they are electroplated with zinc. Then, they are immersed in a liquid bath to form a conversion coating containing hexavalent chromium. To meet the European Union directive regarding End of Life Vehicles, the conversion coating must be changed to trivalent chromium. If I am making the screws, I now use a different liquid to immerse my zinc-plated steel screws. My process is not different.
To make the conversion coating liquid, my supplier must do different things (like extremely complex testing to differentiate between the two valence states for chromium). Since this was a mature industry, but now had a large change in a short time, there is an inevitable cost increase. Perhaps the cost will decrease with time.
If you want more information, try contacting the conversion coating manufacturers.
Atotech
http://www.atotech.com/start.php3?cl_my_id=1003980
Aldoa
http://www.aldoaco.com/
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Process difference between Cr6 vs Cr3 plating
I shall be perusing the site regularly who know I may even be able to contribute something worthwhile.