Cathodic protection system

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 13/00 (2006.01) C23F 13/02 (2006.01)

Patent

CA 2461020

The cathodic protection system of a concrete structure (22) uses sacrificial anodes such as zinc, aluminum and alloys thereof embedded in mortar. A humectant is employed to impart high ionic conductivity to the mortar in which the anode is encapsulated. Lithium nitrate and lithium bromide and combinations thereof are preferred as the humectant. The anode (10) is surrounded by a compressive, conductive matrix (12) incorporating a void volume between 15% and 50% to accommodate the sacrificial corrosion products of the anode. A void space of at least 5% of the total volume of the anode (12) may be provided opposite to the active face of the anode. Synthetic fibers such as polypropylene, polyethylene, cellulose, nylon and fiberglass have been found to be useful for forming the matrix. A tie wire is used to electrically connect the anode to the reinforcing bar .

Le système de protection cathodique d'une structure en béton (22) selon l'invention fait appel à des anodes solubles, faites par exemple de zinc, d'aluminium ou d'alliages de ces derniers, incorporées dans du mortier. Un humidifiant sert à communiquer une importante conductivité ionique au mortier dans lequel l'anode est encapsulée. L'humectant est de préférence du nitrate de lithium, du bromure de lithium ou des combinaisons de ces derniers. L'anode (10) est entourée d'une matrice (12) compressive conductrice, incorporant un volume vide de 15 % à 50 % afin de loger les produits de corrosion solubles de l'anode. Un espace vide d'au moins 5 % du volume total de l'anode (12) peut être situé en face de la face active de l'anode. Des fibres synthétiques, telles que le polypropylène, le polyéthylène, la cellulose, le nylon et la fibre de verre, se sont avérées utiles à la formation de la matrice. Un fil de ligature est utilisé pour établir une liaison électrique entre l'anode et la barre d'armature.

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