EROSION CORROSION E014
This is an accelerated attack on metal resulting from the combination of mechanical and chemical wear.
The liquid velocities in some pumps, prevents the protective oxide passive layer from forming on the metal surface.
The suspended solids also remove some of the passivated layer increasing the galvanic action.
You see this type of corrosion very frequently at the eye of the pump impeller, or the inside of 90° elbows on the discharge side of a pump that is pumping fluid containing abrasive solids.