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Stripping Electroless Nickel (EN) Plating

Q. Do you have any suggestions for stripping electroless nickel from a 4340 steel component heat treated to a Rockwell C 50-54 hardness. The nickel plating was applied per Mil-C-26074 [link is to spec at TechStreet], class 2 grade B at .0005 to .0007 thickness.

Sam Poutous
Central Point, Oregon

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A. Several products exist as the Enstrip EN of Enthone OMI which is used according to the bulletin. Another very easy and quick way to strip nickel is using 100% nitric acid with 10% of acetic acid as inhibitor. The pieces should be baked to eliminate any trace of humidity to submerge them in the solution without to move it neither to take out it until it is stripped. Note, the pieces should be hung.

Gabriel Ramirez Nuñez
plating - Toluca, Mexico

April 9, 2010

A. Hi, Sam. The site's supporting advertiser, Metalx, offers their B-9 series of strippers for this purpose. Good luck.

Regards,

Mallory book
Electroless Plating - Fundamentals & Applications,
Mallory & Hajdu

Gawrilov book
Chemical (Electroless) Nickel Plating
G.G. Gawrilov

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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