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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 driving power for pitting corrosion is the depassivation of a small area, which becomes anodic while an unknown but potentially vast area becomes cathodic, leading to very localized galvanic corrosion.The corrosion penetrates the mass of the metal, with limited diffusion of ions.n contrast, alloy / environment combinations where the passive film is not very protective usually will not produce pitting corrosion. A good example of the importance of environment / alloy combinations is carbon steel.