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MAPEI > PRODUCT > Pure Zinc Galvanic Anodes for Preventing Corrosion of Reinforcing Steel - Mapeshield™ I
Pure Zinc Galvanic Anodes for Preventing Corrosion of Reinforcing Steel
Mapeshield I is a pure zinc anode for cathodic protection of reinforcing steel against corrosion in new, reinforced structures as well as structures requiring repair. Composed with a zinc core, Mapeshield I has its surface area covered by a special conductive paste; once connected to steel reinforcement rods, the paste stops corrosion, impedes its formation and keeps the system active for many years. When Mapeshield I is attached to the reinforcement rods, the two dissimilar metals (zinc and steel) are connected together in a suitable electrolyte (the concrete). The metal with the most negative potential (zinc) will corrode, and the metal with the least negative potential (steel) remains protected against corrosion. The current generated by the installation of Mapeshield I starts to push the pH level higher, making the concrete more alkaline, and begins pushing chloride ions away.
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