Nace CP 1 - Applications of Impressed Current Cathodic Protection; Power Sources

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Underground Corrosion Control 3:15

CP 1 – Cathodic Protection Tester Course Manual

02/01/05

• Mixed metal oxide-coated titanium

• Conductive polymer

• Scrap iron or steel

• Lead silver

Power Sources

The power source for an impressed current system produces direct current

(DC). Various power sources have been used with impressed current

systems including:

• Rectifiers

• Solar (photovoltaic) cells

• Engine generators

• Wind-powered generators

• Thermoelectric cells

Where AC power is economically accessible, rectifiers have clear economic

and operating advantages over other impressed current power sources.

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.