Thermal-sprayed zinc anodes are used for cathodic protection (CP) systems in Oregon’s reinforced concrete coastal bridges to prevent chloride-induced corrosion damage. Thermal-sprayed zinc performs well as an ICCP anode but the service life of the zinc anode is directly related to the average current density used to operate the systems. Oregon Department of Transportation (DOT) is investigating ways of monitoring the rebar corrosion in reinforced concrete bridges to identify conditions when protection of the rebar is needed. This approach reflects the fact that external protection may not be needed for all environmental conditions, leading Oregon DOT to examine the use of intermittent, galvanic, and constant voltage cathodic protection systems. Results from these types of systems are reported.

Subject
Depolarization, Circuits, Impressed current cathodic protection, Rebar, Zinc anodes, Anode resistance, Anodic reactions, Interfaces, Carbon, Bridges, Concrete, Paints, Anodes
Keywords:
cathodic protection, ICCP, galvanic, intermittent, constant voltage, reinforced concrete, thermal spray, zinc
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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