Cavitation Corrosion
Cavitation corrosion occurs from the repeated collapse of vapor bubbles in liquid media on the metal surface, causing extreme pressure surges and destroying local passive layers. This causes plastic deformation and material loss.
Physicochemical mechanism of action
Vapor bubbles in liquid media form due to pressure reduction, for example in pumps or turbines. These bubbles collapse suddenly and create extreme pressure surges. These surges can destroy local passive layers on the metal surface, leading to chemical corrosion.
Metallurgical relevance & risks when welding
Cavitation corrosion can lead to local cracks and deformation in the material. It reduces the service life of components and parts, especially in machines with high pressure differences. When welding, it is important to restore the passive layers to avoid corrosion.
Workshop practice & instructions
To prevent cavitation corrosion, the following measures should be taken:
• Use high-quality welding materials with good corrosion resistance.
• Ensure that passive layers are restored after welding (e.g., by chemical treatment).
• Regularly inspect components for corrosion and perform cleaning and maintenance as needed.