Crevice Corrosion Mechanism

The combination of low oxygen content in the crevice area compared to the surroundings, sets up an anodic imbalance creating a highly corrosive microenvironment, as depicted in Figure 10. Crevice corrosion is of particular concern in aircraft lap joints. In severe cases, the build up of corrosion products in the lap joint can cause separation of the two metals, known as pillowing.