Green oxide on copper plated bars
Green oxide on copper plated bars
(OP)
We use pre-plated silver plated copper bars, on the edges it is bare copper. This can develop a green oxide over time. Could this hurt anything, can it creep into the silver plated areas?
thanks,
Mark Faulkner
thanks,
Mark Faulkner





RE: Green oxide on copper plated bars
Possible solutions for the exposed areas: Brush plating of silver, brush plating of tin, application of plastisol (brush-on vinyl in a solvent), application of grease or wax (I prefer Alcoa’s Electrical Joint Compound (EJC) No. 2), or painting.
*the green patina is not an oxide; it consists of malachite (basic copper carbonate, CuCO3Cu(OH)2) and usually lesser amounts of brochantite (basic copper sulfate, CuSO43Cu(OH)2) and atacamite (basic copper chloride CuCl23Cu(OH)2).
The copper oxides are the red cuprite, Cu2O, and the black tenorite, CuO.
RE: Green oxide on copper plated bars
thanks in advance
RE: Green oxide on copper plated bars
Check whether he majored in humor.
Of course, you could sinter the copper compound with Y2O3 and BaO in the right proportions to create the ‘1-2-3’ superconductor, allowing a much smaller busbar (provided it was kept in liquid N2).
Yes, of course it will increase the resistance.
Yes, it will undermine and lift off the silver plating. Since silver is galvanically noble to copper, the reaction may be more rapid at the interface.
Is the silver tarnished? If not, perhaps it was chromated or lacquered.