We've got an assembly here showing all kinds of galvanioc corrosion after humidity tests.  Looking at the galvanic chart, I notice that gold and tin are pretty far apart.  Our tin plated shields are what's corroded.

Am I thinking too much into this?  Would ENiG on  PCB really act as the cathode for tin plating, aluminum hardware, etc.?  That would mean an awful lot of corrosion out there, there's lot's of board assemblies like this.

Pete

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