Det beror på vilken metall du menar. Själv kör jag med bl.a. mässsingskopplingar som inte tycks ens ärgade, bara en svag saltutfällning ovanpå. Se http://sv.wikipedia.org/wiki/Elektrokemiska_spänningsserien – ju mer oädel metall desto mer reaktiv, förenklat.
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