Fretting Corrosion
Fretting corrosion is a damage form on contact surfaces caused by oscillating movements and oxidation, leading to fine oxide debris.
Physical-Chemical Mechanism of Action
Fretting corrosion occurs with small, continuous relative movements between two contact surfaces under the influence of humidity. The microscopic movements lead to continuous damage to the surface film and the formation of fine oxides.
Metallurgical Relevance & Risks in Welding
This corrosion can occur on weld contact surfaces, leading to surface wear. It increases susceptibility to cracking and reduces the lifespan of components. In heavily loaded machine parts, this can lead to significant failures.
Workshop Practice & Instructions
To avoid fretting corrosion, careful attention should be paid to the cleanliness and drying of contact surfaces during welding. Use high-quality protective coatings or barriers to minimize contact between surfaces. For heavily loaded parts, periodic inspection and maintenance are required.