Cathodic Protection Training

Applications of Impressed Current Cathodic Protection 

Typical uses of impressed current are:  

for large current requirements, particularly for bare or poorly coated structures in all electrolyte resistivities

as an economical way of protecting structures having dissipated galvanic anodes  to overcome stray current or cathodic interference problems  for protection of large heat exchanger water boxes, oil heater-treaters, and other vessels  for interiors of water storage tanks for exterior bottoms (both primary and secondary) of above ground storage tanks  for underground storage tanks  for underwater components of off shore structures  for foundation piles and sheet piling, both underground and in the water.

Types of impressed Current Anodes 



Graphite  High Silicon Chromium-bearing Cast Iron  Mixed Metal Oxide  Scrap Metal  Magnetite

Polarization of a Structure 

Polarization occurs in a step-like manner with the more positive or cathodic sites polarizing first. As the potential of the first cathodic sites equals the potential of other sites, polarization begins at other sites.

I/R Dropp