Structural Passivation
Structural passivation forms a thin, stable layer on metal surfaces that prevents corrosion. It blocks the exchange of matter between the metal and the environment.
Physico-chemical mechanism of action
Structural passivation is a process in which a thin layer forms on the surface of a reactive metal. This layer consists of a stable arrangement of atoms that prevents direct contact between the metal and corrosive media.
Metallurgical relevance & welding risks
Passivation is especially important in welding to avoid corrosion damage. If passivation conditions are missing or not properly maintained, the service life of the weld can be significantly shortened and cracks can form.
Workshop practice & action guidelines
To ensure effective structural passivation, the following measures must be taken:
• Use correct welding materials and processes that support passivatability.
• Make sure the metal is clean before welding and free of corrosion damage.
• Keep welding temperatures within specified limits to form a stable passivation layer.