Corrosion fatigue
Vibration corrosion cracking results from the interaction of mechanical stress and a corrosive environment. The fatigue strength is reduced, leading to cracks.
Physical-Chemical Mechanism of Action
Mechanical stresses like vibrations or cyclic loads can enlarge microscopic cracks in metals. In a corrosive environment, e.g., salt water or humid air, these cracks react chemically and grow further. This process is called corrosion fatigue.
Metallurgical Relevance & Welding Risks
Corrosion fatigue can cause significant component failure, especially in machines and plants under high loads. Cracks can grow quickly and drastically shorten the material's service life. This raises the risk of failures and can lead to serious safety issues.
Shop Practice & Action Items
To prevent corrosion fatigue, it's important to:
• Minimize or control the corrosive environment (e.g., by using anti-corrosion compounds).
• Reduce or optimize mechanical stress (e.g., by adjusting vibration characteristics).
• Consider corrosion-resistant properties when selecting materials.
• Carry out regular inspection and maintenance to catch and fix cracks early.