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09503 Corrosion Inhibitor Systems for Rebar in Concrete Structures

Picture for 09503 Corrosion Inhibitor Systems for Rebar in Concrete Structures
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Product Number: 51300-09503-SG
ISBN: 09503 2009 CP
Author: Ashok Kumar and Larry D. Stephenson
Publication Date: 2009
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Two types of emerging technologies to mitigate corrosion in reinforced concrete structures were demonstrated at military installations in highly corrosive environments. The first technology consisted of surface-applied corrosion inhibitors, while the second was a surface-applied sacrificial cathodic protection coating. The corrosion inhibitor system consisted of (1) an ionic-anodic type of inorganic penetrating corrosion inhibitor, (2) an organic vapor phase penetrating corrosion inhibitor, and (3) a reactive silicone surface protection agent. The combined application of these three corrosion-inhibiting formulations provided a durable and multifunctional corrosion-inhibiting environment along with a reduction in water penetration rate. The sacrificial cathodic coating system consisted of an inorganic silicate vehicle containing zinc, aluminum, magnesium, and indium metal powders. The coating was applied to a reinforced concrete surface along with titanium mesh strips that were connected to the rebar to conduct cathodic current. Before and after measurements indicated that corrosion rates of the rebar were reduced by a factor of 3.5 for the penetrating corrosion inhibitor and 2.7 for the sacrificial cathodic protection coating. Water permeation rates were also significantly reduced. The results indicated that properly selected and applied penetrating corrosion inhibitors or sacrificial cathodic coating systems can be successfully used to extend the life of reinforced concrete structures by reducing corrosion rates.

Keywords: rebar corrosion, reinforcement bar corrosion, corrosion inhibitors, sacrificial cathodic protection, penetrating corrosion inhibitor, galvanic liquid coating
Two types of emerging technologies to mitigate corrosion in reinforced concrete structures were demonstrated at military installations in highly corrosive environments. The first technology consisted of surface-applied corrosion inhibitors, while the second was a surface-applied sacrificial cathodic protection coating. The corrosion inhibitor system consisted of (1) an ionic-anodic type of inorganic penetrating corrosion inhibitor, (2) an organic vapor phase penetrating corrosion inhibitor, and (3) a reactive silicone surface protection agent. The combined application of these three corrosion-inhibiting formulations provided a durable and multifunctional corrosion-inhibiting environment along with a reduction in water penetration rate. The sacrificial cathodic coating system consisted of an inorganic silicate vehicle containing zinc, aluminum, magnesium, and indium metal powders. The coating was applied to a reinforced concrete surface along with titanium mesh strips that were connected to the rebar to conduct cathodic current. Before and after measurements indicated that corrosion rates of the rebar were reduced by a factor of 3.5 for the penetrating corrosion inhibitor and 2.7 for the sacrificial cathodic protection coating. Water permeation rates were also significantly reduced. The results indicated that properly selected and applied penetrating corrosion inhibitors or sacrificial cathodic coating systems can be successfully used to extend the life of reinforced concrete structures by reducing corrosion rates.

Keywords: rebar corrosion, reinforcement bar corrosion, corrosion inhibitors, sacrificial cathodic protection, penetrating corrosion inhibitor, galvanic liquid coating
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Author: M. Ormellese, F. Bolzoni, E.R. Perez, and S. Goidanich
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The effectiveness of organic commercial migrating inhibitors on steel reinforcements corrosion. Four series of concrete specimens were cast. Two organic migrating inhibitors were applied. Free corrosion potential and corrosion rate of steel rebar were periodically monitored for five years.  Results show that migrating inhibitors are not effective in reducing corrosion rate.
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