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Selective Electroless Nickel Plating or Stripping

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February 22, 2022

Q. Hi Members,

I have a assembly where SS304 liners are press fitted into machined bores in Aluminum body - AA413.
The entire assembly has to be electroless Ni plated (preferable Medium phosphorus) without the SS liners, so basically only the Al surfaces in the assembly have to be plated. This has to be accomplished without masking, since it not sustainable for huge lot.

I experimented some samples with an ENP supplier (where proper preprocessing was ensured), but it is impossible to achieve selective plating of only the Aluminum surfaces without masking of SS liners. Can you suggest techniques by which this can be accomplished in ENP process without masking.
Is there any feasibility of selective stripping which can be used to remove deposits in the SS liner afterwards without affecting the Aluminum surfaces?

Your support and guidance here is highly valued and appreciated.

MANIVANNAN VENKATESAN
- Coimbatore Tamil Nadu
^


February 2022

A. Hi MANIVANNAN. You are presumably from a plating shop rather than a manufacturer because it seems to me that the most practical answer is to press fit the liner after the electroless nickel plating, either by allowing the I.D. to plate or by inserting plugs so it doesn't.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^

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