Metallic corrosion involves the loss of metal at a spot on an exposed surface - ranging from uniform attacks over the entire surface to severe local attacks.
Generally, metallic corrosion involves the loss of metal at a spot on an exposed surface. Corrosion occurs in various forms ranging from uniform attacks over the entire surface to severe local attacks.
Stress corrosion cracking refers to the combined influence of tensile stress (applied or internal) and corrosive environment. The material can crack without any significant deformation or obvious deterioration of the material. Often, pitting corrosion is associated with the stress corrosion cracking phenomena.
Causes of stress
The stresses can be the result of the crevice loads due to stress concentration, or can be caused by the type of assembly or residual stresses from fabrication (e.g. cold working); the residual stresses can be relieved by annealing.
Examples of materials that are subject to stress corrosion cracking:
- Stainless steel in chlorides
- Brass in ammonia
- Natural rubber in Ozone cracking