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topic 7715

Want Cyanide Free Gold Strip Bath


Q. We are currently investigating the possibilities of eliminating all uses of cyanide from our plating processes. The major stumbling block we have found is finding a cyanide free gold strip solution. We selectively plate electroless copper and nickel on plastic and use an immersion gold process on some parts. Occasionally, we need to rework parts and strip inadvertently plated barrels. While we have been able to identify several non-cyanide gold immersion baths, it has proven difficult to find a cyanide free method of stripping gold from these items.

Brian DeBadts
- Rochester, New York


A. These can be used for Au removal: Aqua regia (3HCL:1HNO3) Aqua regia will etch just about every other metal, too
Tri-iodide:400g KI, 200g I2, 1000ml H20. There are other more exotic mixtures, but these are the most common non cyanide ones in use.

Tom Hand
- Woburn, Massachusetts

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