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Metal finishing Q&As since 1989
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Is anyone familiar with SNB process for internal stress control
2004
Dear All,
It is very helpful to discuss some e-forming issue here. I would like to post a question in stress control on nickel sulfamate bath here and hope to get input from all of you.
In a document from Macdermid. it gives a procedure called SNB plating process. It claims that this process will give a stress-free nickel deposition. Conditions for the process are Ni~76g/L, Boric acid 48g/L, Barrett Additive A 22.5g/L, temp 140F, pH 3.0,. Does anyone here has experience in this process? Is any issue to use this process to get stress-free nickel deposition. Is pH too low at around range of 2.8-3.2.
Please give me your opinion and suggetion. I greatly appreciate your help.
Paul Chenoptoelectronics - Santa Rosa, California, USA
2004
SNB? Are you sure it's not BSN (Barret Sulfamate Nickel)? If so, it's an old well-proven process and I'd operate it exactly as Macdermid suggests.
![jeffrey holmes](../portraits/jeffrey_holmes.jpg)
Jeffrey Holmes, CEF
Spartanburg, South Carolina
First of two simultaneous responses --
Yes, it is SNB, a special process for achieving stress-free nickel deposition. Conditions are listed in my original post above. if anyone has experience in this, please help.
TIA.
Paul Chen- Santa Rosa
2004
Second of two simultaneous responses -- 2004
SNB is the designation for sulfamate nickel barrel plating solution. The pH is correct for barrel plating only. Ask Macdermid for an operating data sheet for SNB and SN
![don baudrand](../portraits/don_baudrand.jpg)
Don Baudrand
Consultant - Poulsbo, Washington
(Don is co-author of "Plating on Plastics" [on Amazon or AbeBooks affil links]
and "Plating ABS Plastics" [on Amazon or eBay or AbeBooks affil links])
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