Composite anode for cathodic protection

C - Chemistry – Metallurgy – 23 – F

Patent

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C23F 13/14 (2006.01)

Patent

CA 2681232

The galvanic cathodic protection of steel embedded in concrete structures is enhanced by the utilization of a flexible composite anode assembly containing a sacrificial anode member. The anode member is at least partially covered by a matrix comprising an ionically-conductive material. The conductive material includes at least one electrochemical activating agent such as a mixture of lithium bromide and lithium nitrate and a compressible water-retaining mineral such as a phyllosilicate mineral. The presence of this mineral in the matrix increases the current delivered by the anode, thereby resulting in a greater level of cathodic protection, and a longer effective service life of the anode. Exfoliataed vermiculite is a preferred phyllosilicate mineral and is present in an amount of between about 2% and about 15% by weight, based on the total weight of the matrix.

La protection cathodique galvanique d'acier incorporé dans des structures en béton est amplifiée par l'utilisation d'un ensemble d'anode composite flexible contenant un organe d'anode sacrificiel. L'organe d'anode est au moins partiellement couvert par une matrice comprenant un matériau ioniquement conducteur. Le matériau conducteur comprend au moins un agent d'activation électrochimique tel qu'un mélange de bromure de lithium et de nitrate de lithium, et un minéral de rétention d'eau compressible tel qu'un minéral de phyllosilicate. La présence de ce minéral dans la matrice augmente le courant délivré par l'anode, conduisant ainsi à un niveau de protection cathodique supérieur et à une durée de vie efficace de l'anode prolongée. Minéral phyllosilicate préféré, la vermiculite exfoliée est présente dans une quantité comprise entre environ 2 % et environ 15 % en poids, par rapport au poids total de la matrice.

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