Sacrificial and Impressed Current CP

Sacrificial	Impressed Current
No need for an external power source	Requires an external power source
Easy to design and install	Requires skillful design and installation
Uncontrollable	Can be controlled
Used only for limited surface areas and well-coated structures	Can be used for uncoated surfaces and can be used for any surface area
Has no detrimental effects	Can cause serious problems if not handled carefully
Is limited to low resistivity environments	Can be used at any resistivity
Low maintenance	High maintenance