Summary for stripping nickel from invar Discussion
Stripping nickel from Invar is the central issue, but the provided thread excerpt does not include the actual question or any technical answers beyond the contributor line for Milt Stevenson, Jr., a plating shop technical manager in Syracuse, New York. Because the substantive discussion is missing, no reliable process details, chemistry, or cautions can be summarized from this source alone. The only clearly attributable information is the author identification, not a stripping recommendation. If the full thread were available, it would be possible to condense the specific method, risks to the Invar substrate, and any advice on whether nickel can be removed safely and effectively.
adv.
Q. We strip nickel plating from Invar using a cyanide based solution and for the most part have success, however, from time to time have catastrophic results where the parts are etched and attacked. Despite concentration checks, electrically isolating parts and tank sidewalls, etc., we’re never able to recreate the etching (and other non-Invar parts in tank at same time are fine). Any thoughts on what might be going on? While I’m convinced that there is a good bit of science behind what we do, part of me holds out that there is still a blend of witchcraft, voodoo and alchemy involved.
Milt Stevenson, Jr.
Plating shop technical manager – Syracuse, New York
February 7, 2022