Could try soaking them in vinegar for a day; that should remove any corrosion... I'm like 80% sure.
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As pete says, whether it's the plating or the base metal, ultimately, it oxidizes. Oxygen from the air combines with the metal, creating an oxidation layer which is typically very hard, and very non-conductive. Chemical treatments or files/wire brushes can remove the oxidation layer, but depending on the base metal, the oxidation layer may quickly form again after exposing fresh metal. Like I mentioned above, a vinegar bath may be a quick (potentially temporary) fix. There's actually a solution called 'liquid tin', which is typically used to give copper on PCBs a tin plating, which miiight work on lamp sockets (I have not tried it myself). Tin has a decent resistance to corrosion so I'd give that stuff a 50/50 chance of working.
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