Crevice corrosion
Crevice corrosion occurs in narrow spaces or under coverings due to oxygen depletion and limited electrolyte exchange. The lack of oxygen intensifies corrosion compared to the free surface.
Physical-chemical mechanism of action
Crevice corrosion occurs when in tight gaps or under coverings there is a lack of oxygen and limited electrolyte exchange. Without sufficient oxygen, the corrosion reaction potential cannot be reached, which increases the corrosion rate.
Metallurgical relevance & risks in welding
Crevice corrosion can lead to cracks and deformation, especially in highly stressed components. It can also significantly shorten the service life of weld joints. In the workshop, it can arise from missing surface treatment or poor coverage.
Workshop practice & instructions
To avoid crevice corrosion, clean and cover the components carefully after welding. Use suitable anti-corrosion materials such as paint or spray coating for surface treatment. Make sure that no gaps or crevices are created that could trap oxygen and electrolytes.