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Corrosion protection of steel rebar in concrete using migrating corrosion inhibitors
The effectiveness of two commercially available migrating corrosion inhibitors (MCI) for steel rebar in concrete was investigated. Ten concrete specimens with varying densities were prepared with reinforcement placed at 1 inch (2.5 cm) concrete coverage. Corrosion inhibitors were applied to the surfaces of the concrete after 28 days of curing. Specimens were immersed in a 3.5% sodium chloride solution. Using DC Electrochemical and Electrochemical Impedance Spectroscopy, the specimens were evaluated to determine changes in their corrosion potential and resistance polarization (Rp ) over 378 days period. These MCI products have exhibited promising corrosion inhibiting properties by maintaining a high resistance polarization (low corrosion rate) for the rebar in concrete. The MCI products proved to be more effective in the low-density concrete samples. XPS analysis demonstrated the presence of inhibitor on the steel rebar surface, indicating that the MCI did migrate through the concrete layer to the rebar for corrosion protection. The XPS depth profiling showed presence of a 100 nm layer of an amine-rich compound on the rebar surface, which justify increase in the Rp values and corrosion protection on the steel rebars in the MCI treated concrete samples.
Corrosion protection of steel rebar in concrete using migrating corrosion inhibitors
The effectiveness of two commercially available migrating corrosion inhibitors (MCI) for steel rebar in concrete was investigated. Ten concrete specimens with varying densities were prepared with reinforcement placed at 1 inch (2.5 cm) concrete coverage. Corrosion inhibitors were applied to the surfaces of the concrete after 28 days of curing. Specimens were immersed in a 3.5% sodium chloride solution. Using DC Electrochemical and Electrochemical Impedance Spectroscopy, the specimens were evaluated to determine changes in their corrosion potential and resistance polarization (Rp ) over 378 days period. These MCI products have exhibited promising corrosion inhibiting properties by maintaining a high resistance polarization (low corrosion rate) for the rebar in concrete. The MCI products proved to be more effective in the low-density concrete samples. XPS analysis demonstrated the presence of inhibitor on the steel rebar surface, indicating that the MCI did migrate through the concrete layer to the rebar for corrosion protection. The XPS depth profiling showed presence of a 100 nm layer of an amine-rich compound on the rebar surface, which justify increase in the Rp values and corrosion protection on the steel rebars in the MCI treated concrete samples.
Corrosion protection of steel rebar in concrete using migrating corrosion inhibitors
Korrosionsschutz von Stahlstäben in Beton unter Verwendung beweglicher Korrosionsinhibitoren
Bavarian, B. (author) / Reiner, L. (author)
2001
10 Seiten, 5 Bilder, 14 Quellen
Conference paper
Storage medium
English
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