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topic 32877

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 Chen
optoelectronics - 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
Jeffrey Holmes, CEF
Spartanburg, South Carolina


First of two simultaneous responses -- 2004

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


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
Don Baudrand
Consultant - Poulsbo, Washington

(Don is co-author of the
book "Plating on Plastics")



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