Corrosion behavior of rebar for intermittent cathodic protection of coastal bridges
A number of reinforced concrete bridges on the Oregon coast are protected against chloride-induced corrosion damage by means of impressed current cathodic protection (ICCP). Thermal-sprayed Zn serves as the anode in these systems. Rebar in the concrete can remain passive and protected for some period of time after the CP system is turned off. The active-passive corrosion behavior of rebar in simulated pore solution (SPS) was investigated as a function of pH and Cl- concentration as part of a study of intermittent ICCP operation. Rebar corrosion rates in SPS were determined from polarization curves by fitting the Butler-Volmer equation and the linear polarization equation. Analysis of the passive film in SPS by x-ray diffraction and surface enhanced Raman spectroscopy showed it to be largely Fe3O4. However, the Fe(OH)2 content increased with cathodic polarization time.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States)
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE); Oregon Department of Transportation
- OSTI ID:
- 896395
- Report Number(s):
- DOE/ARC-2001-004; TRN: US200704%%115
- Resource Relation:
- Conference: NACE Northern Area-Western Region Conference: Shining a Northern Light on Corrosion, Anchorage, AK, Feb. 25-28, 2001
- Country of Publication:
- United States
- Language:
- English
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