A corrosion pit is a local notch that can initiate cracking under cyclic load. Static salt-spray hours alone do not predict dynamic service life.
Corrosion and stress amplify each other
Corrosion damages surface integrity while cyclic tension grows defects. Failure can occur much earlier than for the same geometry in a dry environment.
Prevent trapped liquid
Coil contacts, hook roots, interfaces and closed cavities retain water or cleaner. Drainage, ventilation and galvanic compatibility matter.
Include coating damage
Assembly scratches, coil rub and tool contact can break protection. Samples should experience real assembly before environmental and cycle testing.
Preserve surface evidence
Record rust location, wear and coating condition before cleaning a fracture. Aggressive cleaning can remove evidence of the crack origin.
References
This article is informed by public standards catalogues and industry engineering resources. Project values should be confirmed by drawings, material certificates and sample validation.