Stress corrosion cracking is the formation of cracks due to the combined effects of a corrosive environment and tensile stress. The metal may appear largely unaffected by corrosion, yet cracks can grow and eventually lead to unexpected failure.
Key Properties of Stress Corrosion Cracking
- Is the combined effect of a corrosive environment, susceptible material and a tensile stress.
- Classic examples are caustic embrittlement of steel and season cracking of brass.
- Stress may come from a number of different sources: applied, residual, thermal or welding.
- Is environment specific.
Where does it occur?
- Pressure vessels
- Pipelines
- Welded structures
- Heat exchangers
How to Control Stress Corrosion Cracking?
Stress Corrosion Cracking may be controlled in a variety of ways, including:
- Removing or lowering the stress
- Eliminate corrosive environment
- Change alloy selection
- Cathodic protection
- Inhibitors
- Coatings
Source: Chesterton ARC Manuals
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