Corrosion fatigue
Corrosion fatigue is damage to materials due to cyclic loading in a corrosive environment, leading to a reduction in fatigue strength.
Physicochemical Mechanism of Action
Corrosion fatigue occurs when a material is subjected to cyclic loading while in a corrosive environment. The repeated loading causes microscopic cracks in the material, which are exacerbated by corrosion. This impairs the fatigue strength of the material.
Metallurgical Relevance & Risks in Welding
Corrosion fatigue can significantly reduce the service life of components, especially in chemically aggressive environments. It increases susceptibility to cracking and failure under mechanical stress. In welding, this can lead to reduced safety and premature failure of components.
Workshop Practice & Instructions
To minimize corrosion fatigue, it is important to control the corrosive environment and protect the material before welding. Use appropriate protective agents and ensure a correct welding procedure with optimal temperatures and times. In particularly aggressive environments, additional corrosion control methods such as galvanizing or special surface treatments should be applied.