• JayleneSlide@lemmy.world
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    5 months ago

    Stainless steel that gets coated is no longer stainless steel. Stainless steel requires exposure to sufficient oxygen in order to maintain the protective oxide layer.

    These are rudder bolts from the same gudgeon on my sailboat. The black stuff is anoxic corrosion.

    • boonhet@lemm.ee
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      5 months ago

      TIL.

      I suppose that’s why nobody makes car body panels out of it.