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1 Fretting corrosion is primarily a surface damage phenomenon occurring as a result of small cyclic movements between two materials caused by cyclic loading. Fretting damage can occur in vacuum, although it then would be better to speak of fretting, rather than fretting corrosion.
Why Does Bronze Tarnish? The tarnish, or patina, is caused by a chemical reaction between the various metals in the alloy, and acids or other corrosive materials. Acids in the skin can cause uneven tarnish from over-handling, and over time even dust will have leave an unattractive patina. Exposure to chloride will cause a damaging corrosive tarnish called bronze disease that will pit and eventually destroy the metal.