Aluminum valve stem + steel valve cap = fun afternoon of not riding.
Tyre Valve Disaster!!!
Switching back to plastic valve caps, though in theory copper antiseize would work to prevent corrosion on steel/aluminum threads. Don't need steel caps with a 90-degree stem due to lack of centripetal force. Die grinder chewed up the threads a little while cutting off the cap. I'll replace the valve stem at the next tire change.
White chunks are barry corrosion that glued cap on like epoxy
Galvanic corrosion is an electrochemical process in which one metal corrodes preferentially to another when both metals are in electrical contact and immersed in an electrolyte. The same galvanic reaction is exploited in primary batteries to generate a voltage.
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