Cathodic protection system using impressed current and galvanic action
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United States of America Patent
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Sep 4, 2007
Grant Date -
May 25, 2006
app pub date -
Nov 26, 2004
filing date -
Nov 23, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Cathodic protection of steel in a building or other concrete or similar structure is provided by locating an anode in a suitable location adjacent to the steel and providing an impressed current from a power supply to the anode. The anode is formed from a material which is more electro-negative than the steel so that in the event that the power supply falls below the galvanic potential therebetween, current flows under galvanic action to replace the impressed current. A diode in the circuit prevents flow of current across the power supply but allows the galvanic current when the power supply fails open circuit. An additional diode can be provided in the event the power supply fails closed circuit to prevent reverse current flow.
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