Galvanic corrosion between a stainless steel lock washer and a zinc-plated carbon steel screw?
I'd be grateful for some advice.
I'm designing an assembly involving a screw with an external tooth lock washer. Would it be all right if the screw is zinc-plated 10B21 low-carbon boron steel, and the lock washer is 304 stainless?
We want carbon steel for the screw so that it will stay in our magnetic screwdriver bits for easier assembly, and we want 304 stainless for the washers because that's the only material we can find off-the-shelf in this size of external tooth lock washer.
Should we be concerned about galvanic corrosion though? It looks like it might be a problem from the galvanic series, but I'm not sure how significant it would be in practice, or how much protection we can expect from the zinc plating (maybe none because of the washer teeth)?
The screw will go into a threaded hole in an aluminum part, but the lock washer won't contact the aluminum directly since there's a sheet of PEEK between them.
The assembly will be used in an electronic device intended for indoor use, though some spaces might not be climate controlled.
Thanks for the help!