The authoritative public forum
  for Metal Finishing since 1989
-----

Heat treating of Nickel electroforms

adv.  

I am plating from a Ni sulfamate solution (~84g/L Ni), pH 4 buffered with boric acid, adjusted with sulfamic acid ⇦this on eBay or Amazon [affil links] , on to a cylindrical drum. Current density ranges from 10-60ASF, thickness ~200 microns.

We peel the Ni coating off, clamp it down flat and heat treat in air at ~300C for 6hrs then furnace cool to room temp. The only reason for the heat treatment is to flatten the part.

What effect does heat treating have on the Ni part, specifically related to hardness/grain size? Is there a curve similar to the TTT curves for steel that would illustrate what is happening?

Thanks,

Brett Dening
R&D - Niskayuna, New York
2005

Your type of work seems highly technical and your questions very hard to answer briefly, so it would better for you to get a copy of the book Properties of Electrodeposited Metals and Alloys [affil link to Amazon or on AbeBooks affil links] , W. Safranek. Available through this site.

Guillermo Marrufo
Monterrey, NL, Mexico
2005