Letter 2684

Removing electroless Ni from steel

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I am trying to remove electroless Nickel coating and Copper strike from steel without corroding steel surface. So far my results are very inconsistent: parts cleaned in the same acid vat never look the same. My acid bath is basically Hydrochloric/Sulfuric acids at 1 to 3 ratio with some surfactants and wetting agents. What am I missing in this process?

Thank you in advance,
Nina

Nina Geller
- Memphis, TN

Nina, You can try the following formulation for your application: Sodium hydroxide 7-9 oz/gal Ethylenediamine 15-17 oz/gal m-Nitrobenzene sulfonic acid 5-7 oz/gal temperature 165-175 F Good luck! Ling

L. Hao

Nina Geller Memphis Tn: I like a product called B-9 By Metalx Inc., across the board its the best that I have used

Chris Snyder

Please also see our FAQs on Stripping of Electroless Nickel.

Regards,

 
Ted Mooney, P.E.
Finishing.com Inc. - Brick, NJ

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