C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
C23F 13/02 (2006.01)
Patent
CA 2289887
The present invention relates to a method of cathodic protection of reinforced concrete, and more particularly, to a method of maintaining or improving current delivery from an anode used in a cathodic protection system. The method of the present invention comprises applying a conductive paint onto an exposed surface of the concrete in an amount effective to form a conductive paint anode bonded to the surface. The anode and concrete have an interface. The conductive paint anode is permeable. The conductive paint anode is electrically connected to the reinforcement through a source of impressed current. A lithium salt solution selected from the group consisting of a lithium nitrate (LiNO3) solution, a lithium bromide (LIBr) solution, and combinations thereof, is applied to the external surface of the anode after the conductive paint anode has been applied to the concrete. The lithium salt solution quickly and effectively migrates through the pores of the permeable anode to the interface between the anode and the concrete. The lithium salt at the interface functions to provide improved current delivery. The lithium salt solution preferably comprises a surface active agent which wets the exposed surface of the conductive paint anode and facilitates migration of the solution through the anode to the interface of the anode with the concrete.
Bennett Jack E.
Clear Kenneth C.
Bennett Jack E.
Clear Kenneth C.
Fetherstonhaugh & Co.
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