Cathodic protection methods and apparatus

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 13/00 (2006.01) C23F 13/14 (2006.01) C23F 13/16 (2006.01)

Patent

CA 2305357

Apparatus, compositions and methods provide cathodic protection to a structure by placing an anode layer (10) directly between the structure (22) and its underlying foundation (30). Structures contemplated to be protected in this manner include especially very large structures such as above ground storage tanks. In one aspect of preferred embodiments, the anode layer (10) comprises sheets of at least 85 % aluminum with other alloying elements such as magnesium (0.05 to 6 %), zinc (0.1 to 8 %), indium (0.05 to 0.03 %) and tin (0.05 to 0.2 %) added for the purposes of optimizing current yield, polarization and ease of manufacturing the sheet. In another aspect of preferred embodiments, the anode layer (10) comprises at least two overlapping sheets.

L'invention concerne un appareil, des compositions et des procédés fournissant une protection cathodique à une structure en plaçant une couche anodique (10) directement entre la structure (22) et son fondement (30). Les structures visées par ce système de protection sont notamment des structures de très grandes dimensions telles que des réservoirs suspendus. Dans un aspect des modes de réalisation préférés, la couche anodique (10) comprend des feuilles constituées d'au moins 80 % d'aluminium avec d'autres éléments d'alliage tels que le magnésium (0,05 à 6 %), le zinc (0,1 à 8 %), l'indium (0,005 à 0,03 %) et l'étain (0,05 à 0,2 %) ajoutés dans le but d'optimiser le rendement courant et la polarisation, et de faciliter la fabrication de la feuille. Dans un autre aspect des modes de réalisation préférés, la couche anodique (10) comprend au moins deux feuilles superposées.

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