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08053 Effectiveness of Aluminum Anodes for CP in Low Chloride Environment

Picture for 08053 Effectiveness of Aluminum Anodes for CP in Low Chloride Environment
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Product Number: 51300-08053-SG
ISBN: 08053 2008 CP
Author: Luciano Lazzari, Fabio Bolzoni, Elmer Perez, Grabriela Contreras, and Alessandro Benedetti
Publication Date: 2008
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Aluminum-based alloys are widely used in sea water as galvanic anodes. Conversely, their use in soil is not recommended because they tend to passivate when chloride content is low. However, there are chloride contaminated soil where the use of aluminum anodes may be of interest. The aim of this research is to evaluate the effectiveness of aluminum galvanic anodes in low salinity solutions at different chloride/sulfate ratios. The research followed two phases: electrochemical characterization of anodes through potentiodynamic and free corrosion potential tests in solution with different chloride/sulfate concentration, and galvanic coupling tests performed in soil saturated with chloride solutions (diluted natural or artificial seawater until reaching: 2,000, 6,000 and 19,000 ppm chlorides).
Aluminum-based alloys are widely used in sea water as galvanic anodes. Conversely, their use in soil is not recommended because they tend to passivate when chloride content is low. However, there are chloride contaminated soil where the use of aluminum anodes may be of interest. The aim of this research is to evaluate the effectiveness of aluminum galvanic anodes in low salinity solutions at different chloride/sulfate ratios. The research followed two phases: electrochemical characterization of anodes through potentiodynamic and free corrosion potential tests in solution with different chloride/sulfate concentration, and galvanic coupling tests performed in soil saturated with chloride solutions (diluted natural or artificial seawater until reaching: 2,000, 6,000 and 19,000 ppm chlorides).
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