What are the common causes of propeller damage?

Mechanical collision: hitting a reef, colliding with floating objects.

Cavitation corrosion: Long-term cavitation causes the blade surface to peel off.

Fatigue fracture: Material defects or long-term alternating stress.

Electrochemical corrosion: Seawater electrolysis, especially when different metals are in contact (such as copper propeller + steel shaft).

Repair method:

Minor damage can be repaired by welding and then polished.

Severe deformation or fracture requires replacement of the propeller.