Performance of thermal-sprayed zinc anodes treated with humectants in cathodic protection systems
- JE Bennett Consulting Inc.
- Corrosion Restoration Tech.
- Oregon Dept. of Transportation
Thermal-sprayed Zn anodes are used for impressed current cathodic protection (ICCP) systems in Oregon's reinforced concrete coastal bridges to minimize corrosion damage. Thermal-sprayed Zn performs well as an ICCP anode but the voltage requirement can increase with increasing electrochemical age. It also performs well as a galvanic (GCP) anode but current output can decrease with increasing electrochemical age. Past research has shown that increasing moisture at the Zn anode-concrete interface improves the operation of the thermal-sprayed Zn anode. Humectants, hygroscopic materials that are applied to the surface of the Zn-anode, can increase the moisture at the zinc-concrete interface, thereby improving the performance and extending the anode service life. Results are given for humectant-treated (LiBr and LiNO3) thermal-sprayed Zn anodes used in the laboratory electrochemical aging studies and in field studies on the Yaquina Bay Bridge, Oregon, USA.
- Research Organization:
- Albany Research Center (ARC), Albany, OR (United States); Oregon Department of Transportation
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 895213
- Report Number(s):
- DOE/ARC-2001-100; TRN: US200702%%700
- Resource Relation:
- Conference: 3rd International Conference on Concrete Under Severe Conditions (CONSEC '01), June 18-20, 2001, Vancouver, BC, Canada
- Country of Publication:
- Canada
- Language:
- English
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