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AC 43.13-1B 9/8/98 at a stress level far below the fatigue limit of an uncorroded part, even though the amount of corrosion is relatively small. 6-22. FRETTING CORROSION. Fretting corrosion,(also known as wear corrosion or friction oxidation) can occur at the interface of two highly-loaded surfaces which are not sup posed to move against each other. However, vibration may cause the surfaces to rub to gether resulting in an abrasive wear known as fretting. (See figure 6-13.) The protective film on the metallic surfaces is removed by this rubbing action. With continued rubbing, metal particles sheared from the surface of the metal combine with oxygen to form metal ox ide. As these oxides accumulate, they cause damage by abrasive action and increased local stress. The most common example of fretting corrosion is the smoking rivet found on engine cowling and wing skins. This is one corrosion reaction that is not driven by an electrolyte, and in fact, moisture may inhibit the reaction. Application of a lubricant or installation of a fretting-resistant material between the two sur faces can reduce fretting corrosion. FIGURE 6-13. Fretting corrosion. 6-23.6-28. [RESERVED.] Page 6-10 Par 6-21PDF Image | AFS-640
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