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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.
The most commonly occurring types of corrosion are Auto and Contact corrosion. Auto corrosion is that which occurs when a metal is in contact with an electrolyte but is not at the same time in contact with any other electrical conductor, neither metallic nor non-metallic.