Treatment process for concrete

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 13/16 (2006.01) C23F 13/02 (2006.01)

Patent

CA 2601516

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.

L'invention concerne un système à anode unique utilisé dans plusieurs traitements électrochimiques pour combattre la corrosion de l'acier dans le béton. Ce système comprend un métal sacrificiel capable de supporter des densités élevées de courant anodique appliqué avec un détail de connexion d'anode à courant appliqué et un matériau d'encastrement poreux contenant un électrolyte. Initialement le courant est amené du métal sacrificiel [1] à l'acier [10] à l'aide d'une source d'alimentation [5] qui convertit l'oxygène et l'eau [14] en ions hydroxyle [15] sur l'acier et qui attire les ions de chlorure [16] dans le matériau poreux [2] autour de l'anode de sorte que les sites corrodés passent de l'acier à l'anode, rétablissant ainsi la passivité de l'acier et activant l'anode. La prévention cathodique est ensuite appliquée. De préférence, c'est la prévention cathodique sacrificielle qui est appliquée par déconnexion de la source d'alimentation et par connexion directe de l'anode sacrificielle activée sur l'acier.

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