approach. Crevice corrosion is a kind of corrosion which occurs in narrow crevices filled with a liquid and where the oxygen level is very low e.g. on gasket surfaces, lap joints and under bolt and rivet heads. A special form of crevice corrosion is called deposit corrosion. This is when the corrosion is found under non-metallic deposits or coatings on the metal surface. Steels with good resistance to pitting corrosion have also good resistance to crevice corrosion.
Stress corrosion cracking, SCC Corrosion attacks on a metal subjected to a tensile stress and exposed to a corrosive environment are called stress corrosion cracking (SCC). During stress corrosion cracking the metal or alloy can remain virtually unattacked on most of its surface, while fine cracks progress through it. For austenitic stainless steels the risk for SCC is especially big in solutions containing chlorides or other halogens. The risk increases with increasing salt concentration, tensile stress and also increased temperature.