Electrolysis: processes – compositions used therein – and methods – Electrolytic material treatment – Metal or metal alloy
Reexamination Certificate
2011-03-22
2011-03-22
Bell, Bruce F (Department: 1759)
Electrolysis: processes, compositions used therein, and methods
Electrolytic material treatment
Metal or metal alloy
C205S724000, C205S725000, C205S726000, C205S727000, C205S730000, C205S731000, C205S732000, C205S733000, C204S196020, C204S196040, C204S196060, C204S196070, C204S196100, C204S196170, C204S196180, C204S196220, C204S196230, C204S196250, C204S196300, C204S196360, C204S196370
Reexamination Certificate
active
07909982
ABSTRACT:
A single anode system used in multiple electrochemical treatments to control steel corrosion in concrete comprises a sacrificial metal that is capable of supporting high impressed anode current densities with an impressed current anode connection detail and a porous embedding material containing an electrolyte. Initially current is driven from the sacrificial metal [1] to the steel [10] using a power source [5] converting oxygen and water [14] into hydroxyl ions [15] on the steel and drawing chloride ions [16] into the porous material [2] around the anode such that corroding sites are moved from the steel to the anode restoring steel passivity and activating the anode. Cathodic prevention is then applied. This is preferably sacrificial cathodic prevention that is applied by disconnecting the power source and connecting the activated sacrificial anode directly to the steel.
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Davison Nigel
Glass Gareth
Roberts Adrian
Bell Bruce F
Davis & Bujold P.L.L.C.
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