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Crevice Corrosion

Crevice corrosion is a localized form of corrosive attack.  Crevice corrosion occurs at narrow openings or spaces between two metal surfaces or between metals and nonmetal surfaces.  A concentration cell forms with the crevice being depleted of oxygen.  This differential aeration between the crevice (microenvironment) and the external surface (bulk environment) gives the the crevice an anodic character.  This can contribute to a highly corrosive condition in the crevice.  Some examples of crevices are listed below:

•   Flanges

•   Deposits

•   Washers

•   Rolled tube ends

•   Threaded joints

•   O-rings

•   Gaskets

•   Lap joints 

•   Sediment

Some methods for reducing the effects of crevice corrosion are listed below:

•   Eliminate the crevice from the design

•   Select materials more resistant to crevice corrosion

•   Reduce the aggressiveness of the environment

Back to Corrosion

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Last modified: September 11, 2007