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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.
1 The surfaces of these metals will tarnish in the presence of oxygen forming a protective oxide coating. 2  This coating protects the bulk of the metal against further oxidation (the metal is passivated). 3  If the surface of the metal is in contact with both oxygen and water, corrosion can occur.