What is the difference between pitting and crevice corrosion? Corrosion
The main difference between pitting and crevice corrosion is the geometry of the corrosion site. Whereas pitting corrosion occurs across the surface of a component, crevice corrosion is associated with a crevice, be that one that forms around a fastener, washer or joint, in a sharp corner or in an area where the flow of a liquid is slowed i.e. a dead spot.
If a corrosion pit is allowed to continue to corrode, in effect it forms its own crevice and the rate of corrosion will accelerate as the conditions within the pit become more aggressive.