Corrosion expert witnesses may write reports and opine on galvanic corrosion, pitting corrosion, corrosion fatigue, and more. The Corrosion Technology Laboratory at the NASA Kennedy Space Center defines corrosion fatigue:
Corrosion fatigue is a special case of stress corrosion caused by the combined effects of cyclic stress and corrosion. No metal is immune from some reduction of its resistance to cyclic stressing if the metal is in a corrosive environment. Damage from corrosion fatigue is greater than the sum of the damage from both cyclic stresses and corrosion. Control of corrosion fatigue can be accomplished by either lowering the cyclic stresses or by corrosion control.
For more, corrosion.ksc.nasa.gov.