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51316-7868-Next Generation Discrete Galvanic Anodes for TEG 043x

Picture for Next Generation Discrete Galvanic Anodes for TEG 043x
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Product Number: 51316-7868-SG
ISBN: 7868 2016 CP
Author: Fred Goodwin
Publication Date: 2016
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$20.00
$20.00
Discrete galvanic anodes are used to minimize the ring/incipient/halo anode effect in concrete repairs relying on sacrificial corrosion of a more active metal than conventional reinforcing steel to provide continued protection. The demand for this protection changes with time based on the corrosion activity of the steel requiring protection. When the concrete is repaired the repair material creates a strongly cathodic area within the repair that accelerates corrosion in the reinforcing steel immediately adjacent to the repair area. This requires an initially high current flow from the discrete galvanic anode that decreases with time. Some new hybrid technologies use a short interval of impressed current cathodic protection to create a passive condition in the halo area to move halides away from the reinforcing steel and realkalize the concrete in contact with the reinforcing steel. Following this impressed current treatment protection is maintained through galvanic activity of zinc after the impressed current is removed. A novel technology has been developed using two active galvanic metals magnesium and zinc. A small amount of magnesium can provide the "jump start" to create an initial high polarization similar to these other hybrid anodes without the need external power rewiring of the cathodic protection system or reliance on complex electrical circuitry to control the impressed current phase of treatment. The new hybrid anode is simply installed exactly like conventional single stage anodes. Following consumption of the magnesium maintenance current is provided by conventional zinc galvanic protection. Furthermore because the galvanic reaction is controlled by the environmental conditions of the installation and corrosion activity of the reinforcing steel there is no potential for overvoltage complex wiring or any additonal activity required after the hybrid anode is installed.
Discrete galvanic anodes are used to minimize the ring/incipient/halo anode effect in concrete repairs relying on sacrificial corrosion of a more active metal than conventional reinforcing steel to provide continued protection. The demand for this protection changes with time based on the corrosion activity of the steel requiring protection. When the concrete is repaired the repair material creates a strongly cathodic area within the repair that accelerates corrosion in the reinforcing steel immediately adjacent to the repair area. This requires an initially high current flow from the discrete galvanic anode that decreases with time. Some new hybrid technologies use a short interval of impressed current cathodic protection to create a passive condition in the halo area to move halides away from the reinforcing steel and realkalize the concrete in contact with the reinforcing steel. Following this impressed current treatment protection is maintained through galvanic activity of zinc after the impressed current is removed. A novel technology has been developed using two active galvanic metals magnesium and zinc. A small amount of magnesium can provide the "jump start" to create an initial high polarization similar to these other hybrid anodes without the need external power rewiring of the cathodic protection system or reliance on complex electrical circuitry to control the impressed current phase of treatment. The new hybrid anode is simply installed exactly like conventional single stage anodes. Following consumption of the magnesium maintenance current is provided by conventional zinc galvanic protection. Furthermore because the galvanic reaction is controlled by the environmental conditions of the installation and corrosion activity of the reinforcing steel there is no potential for overvoltage complex wiring or any additonal activity required after the hybrid anode is installed.
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04044 Performance of High Potential Magnesium Anodes: Factors Affecting Efficiency

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Magnesium anodes are provided to the corrosion control industry by a number of domestic and international manufacturers and distributors.  Anode composition is commonly the only criterion used for quality control by the end users. Many of the anodes, however, have been shown to meet the compositional and potential specifications, and yet have had measured efficiencies as low as 7%.
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