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Galvanic Protection
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General |
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Corrosion Management Strategies |
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There are three basic levels of active corrosion protection available. They are generally refered to as: Corrosion Prevention, Corrosion Control and Cathodic Protection. All are essentially the same in that a protective current is provided to prevent or reduce the corrosion activity of the reinforcing steel. Each level is suitable for a given range of applications. They differ in terms of the intensity of the protective current provided to the steel. |
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How Anodes Work |
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When two dissimilar metals are coupled together in an electrolyte, the metal with the higher potential for corrosion (more negative voltage) will corrode in preference to the more noble metal. In concrete repair applications, the zinc core of the galvanic anode will corrode and provide an electrical current to the reinforcing steel that mitigates corrosion activity. |
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Galvashield XP |
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Sika Galvashield XP embedded galvanic anodes are used in concrete rehabilitation to prevent the formation of new corrosion sites adjacent to completed patch repairs. Sika Galvashield XP consists of a sacrificial zinc core that is activated by the surrounding specially formulated cementitious mortar. The small puck-shaped anode [2.5 in. (64 mm) diameter by 1.1 in. (27 mm) high] is quickly and easily fastened to the exposed reinforcing steel. Once installed, the zinc core corrodes preferentially to the surrounding rebar, thereby providing galvanic corrosion prevention to the adjacent reinforcing steel. |
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Galvashield XP + |
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Sika Galvashield XP+ embedded galvanic anodes utilize an innovative zinc core design surrounded by a specially formulated cementitious mortar to provide high capacity, high current output performance. Sika Galvashield XP+ is used in concrete rehabilitation to control active corrosion adjacent to completed patch repairs and to prevent the formation of new corrosion sites. The small puck-shaped anode [2.5 in. (64 mm) diameter by 1.1 in. (27 mm) high] is quickly and easily fastened to the exposed reinforcing steel. Once installed, the zinc core corrodes preferentially to the surrounding rebar, thereby providing galvanic corrosion prevention to the adjacent reinforcing steel. |
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Galvashield CC |
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Sika Galvashield CC embedded galvanic anodes are used to control on-going corrosion and to prevent the initiation of new corrosion activity in concrete structures. Galvashield CC anodes consist of a sacrificial zinc core that is activated by the surrounding specially formulated precast cementitious mortar. The cylindrical anode, available in a variety of standard sizes, is quickly and easily installed into concrete that is mechanically sound but has on-going corrosion activity. Once installed, the zinc core corrodes preferentially to the surrounding rebar, thereby providing galvanic corrosion control to the adjacent reinforcing steel. Custom size anodes are available for specific project needs. |
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Sika Galvashield Embedding Mortar |
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Sika Galvashield Embedding Mortar is a controlled resistivity mortar for use with Sika Galvashield CC anodes. The mortar is designed to provide a low resistance environment around the anode and improved performance. |
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