Effectiveness of cathodic corrosion protection


A. Electrolyte

water, soil and atmospheric moisture


B. Element >>> element voltage

A voltage can result in different influences, such as

✔  inhomogeneous steel interface
✔  Temperature differences
✔  different electrolyte compositions
✔  Contact between different metals for example: Fe-CU

To suppress this element voltage is the anode and cathode with an insulating material covered, i. e. coated.


Coating materials: Paints, Bitumen, PE insulation


This element voltage is theoretically prevented by the passive corrosion protection. As always damages (Faults) of the passive protection, active protection (CP) must be used in addition. The protection current flows only at the defects in the steel and prevents corrosion.