concentration-cell corrosion 

https://doi.org/10.1351/goldbook.C01224
The local variation of the corrosion rate due to the action of a corrosion cell resulting from inhomogeneous composition of the environment.
Source:
PAC, 1989, 61, 19. (Electrochemical corrosion nomenclature (Recommendations 1988)) on page 22 [Terms] [Paper]