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topic 3085

Considerations for electroplating of ZA-27 diecasting alloy


A discussion started in 1999 but continuing through 2020

1999

Q. Die casting Alloys ZA-27, which has the highest aluminium, presents special considerations for plating-- for example degrease with solvent. What other special considerations are there for plating application over ZA-27 die casting Alloys? Thanks.

Joaquin M.
- Medellin, Colombia


2000

Q. Concerning ZA-27 Die cast alloy:

We are currently looking for an acceptable method of coating the ZA-27 parts in order to protect against corrosion. Do you have any suggestions? What kind of plating? Is there an anodizing method that works? How about chromate conversion? Also, do you have similar experience with ZA-12 or ZA-8?

Thanks,

Steve M.

Steven Macri
- New Hope, Pennsylvania

----
Ed. note: Thread 18416 addresses anodizing of ZA-27.



Need nickel plating service onto Zinc-Aluminum alloy

September 29, 2009

RFQ: I am looking for a shop that can plate nickel onto ZA-27. looking for larger volumes of small parts to be plated.

Jim Portmann
OEM - Delano, Minnesota, USA
^- Sorry, this RFQ is outdated
     View Current RFQs




High Phos Nickel Plating on Zinc ZA27

March 30, 2020 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. I have a situation where we are using a Zinc ZA27 part that needs Nickel Plating for corrosion/reactive resistance to E85 fuel. We have been using High Phos Nickel plating for many of our zinc parts (Made of ZA3 and ZA8) but this particular part made of ZA27 has been giving us issues. The part is copper flashed first and the copper flashing does not seem to be adhering correctly. The final part after Nickel plating shows blistering in many locations. Any suggestion on how to mitigate the issue will be of help. I am the specifier of the product not the plater.

Steven Baynham
- St. Louis Missouri


April 2020

A. Hi Steven.

ZA27 contains 27% aluminum which is surely why processes designed for zinc diecastings aren't working well. Although I don't actually have any experience with this alloy, I am pretty confident that treating it as an aluminum die casting rather than a zinc one will work. In other words no electrocleaning (only a mild non-etch aluminum cleaner), followed by a mild acid dip, zincating, and then the copper strike.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
Aloha -- an idea worth spreading


April 7, 2020

thumbs up sign Thanks for the response. That is exactly what I was thinking but I am not the plater. The plating company I am using now has been very secretive about their process which I understand. I will follow up with them again and begin talks with a new plating company as well.

Steven Baynham [returning]
- Pacific Missouri USA

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