Humectants To Augment Current From Metallized Zinc Cathodic Protection Systems on Concrete
- Albany Research Center, DOE
- J.E. Bennett Consulting, Inc.
- ODOT
Cathodic protection (CP) systems using thermal-sprayed zinc anodes are employed to mitigate the corrosion process in reinforced concrete structures. However, the performance of the anodes is improved by moisture at the anode-concrete interface. Research was conducted to investigate the effect of hydrophilic chemical additives, humectants, on the electrical performance and service life of zinc anodes. Lithium bromide and lithium nitrate were identified as feasible humectants with lithium bromide performing better under galvanic CP and lithium nitrate performing better under impressed current CP. Both humectants improved the electrical operating characteristics of the anode and increased the service life by up to three years.
- Research Organization:
- Albany Research Center, Albany, OR (US)
- Sponsoring Organization:
- Oregon Dept. of Transportation, Research Group; Federal Highway Administration (US)
- OSTI ID:
- 808092
- Report Number(s):
- DOE/ARC-TR-03-005; FHWA-OR-RD-03-08
- Country of Publication:
- United States
- Language:
- English
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