Charging a sacrificial anode with ions of the sacrificial material
First Claim
1. A method for use in corrosion protection of a metal section in an ionically conductive material comprising:
- locating a sacrificial anode of a sacrificial material in ionic contact with the ionically conductive material;
causing the sacrificial anode to corrode preferentially in relation to the metal section while the sacrificial anode is connected to the metal section to provide corrosion protection of the metal section by the corrosion of the sacrificial anode such that ions of the sacrificial material are depleted from the sacrificial anode as the sacrificial anode corrodes;
and recharging the sacrificial anode using a current supplied by a DC power supply which causes ions of sacrificial anode material to be re-deposited on the sacrificial anode.
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Accused Products
Abstract
Cathodic protection of steel in concrete is provided by locating an anode assembly including both a sacrificial anode and an impressed current anode in contact with the concrete and providing an impressed current from a power supply to the anode. The impressed current anode forms a perforated sleeve surrounding a rod of the sacrificial anode material with an activated ionically-conductive filler material between. The system can be used without the power supply in sacrificial mode or when the power supply is connected, the impressed current anode can be powered to provide an impressed current system and/or to recharge the sacrificial anode from sacrificial anode corrosion products.
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Citations
49 Claims
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1. A method for use in corrosion protection of a metal section in an ionically conductive material comprising:
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locating a sacrificial anode of a sacrificial material in ionic contact with the ionically conductive material; causing the sacrificial anode to corrode preferentially in relation to the metal section while the sacrificial anode is connected to the metal section to provide corrosion protection of the metal section by the corrosion of the sacrificial anode such that ions of the sacrificial material are depleted from the sacrificial anode as the sacrificial anode corrodes; and recharging the sacrificial anode using a current supplied by a DC power supply which causes ions of sacrificial anode material to be re-deposited on the sacrificial anode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for use in corrosion protection of a metal section in an ionically conductive material comprising:
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locating an impressed current anode in ionic contact with the ionically conductive material; locating a sacrificial anode in ionic contact with the ionically conductive material; providing a DC power supply; connecting a first terminal of a DC power supply to the impressed current anode; connecting a second terminal of the DC power supply to the sacrificial anode so as to cause ions of sacrificial anode material to be deposited on the sacrificial anode. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A method for use in corrosion protection of a metal section in an ionically conductive material comprising:
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locating a sacrificial anode in ionic contact with the ionically conductive material to provide corrosion protection of the of the metal section; and temporarily placing an impressed current anode in ionic contact with a surface of the ionically conductive material and applying a voltage from a DC power supply to the impressed current anode so as to cause ions of sacrificial anode material to be deposited on the sacrificial anode.
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Specification