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Cathodic Protection of Concrete in Harsh Saltwater Environments
Jason ChodachekVector Corrosion Technologies, Inc.
Tampa, Florida
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Overview
• Corrosion of Steel in Concrete• What is Cathodic Protection• Types of protection systems
• Sacrificial (Galvanic) Cathodic Protection• Impressed Current Cathodic Protection
• Project Histories
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Corrosion CellReinforced Concrete
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Fe3O4
γFe2O3
Fe3O4
γFe2O3
Anode
2e -
Cathode
Corrosion Cell in Concrete
-500 mV -350 mV
-200 mV
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Anode Galvanically Protects Surrounding Rebar
-350 mV-200 mV
-1100 mV
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Types of Galvanic and Impressed Current Systems
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Cathodic Protection Systems
• Work by applying current to reinforcing steel to overcome the corrosion process
• Galvanic Systems• Sacrificial metal corrodes to provide electrons
• Impressed Current Systems• D.C. power makes electrons flow from anode to
reinforcement (cathode)
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Galvanic Protection Systems
• Anode has higher “electronegativity”, corrodes in preference to steel
• No outside source of electricity needed• No electrical components to maintain
• Lower driving voltage avoids hydrogen embrittlement of prestressed steels
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• Outside power source required
• High level of control• System monitoring
and maintenance required
+- Permanent
DC PowerSupply
Impressed Current CP
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Impressed Current CP
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ICCP on Marine Bridge Footer
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Surface Applied ICCP System
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Copper Plant, Chile
• Copper concentrate filter plant and shipping built 1996 – 1999
• Corrosion due to cast in chlorides
• Tanks, support structures, and ship loading pier
• ICCP with various anode types– Ebonex conductive ceramic
discrete anodes– Titanium mesh in concrete
overlay– Impressed current and
galvanic anodes in soil
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Galvanic Systems
• Discrete Anodes
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Discrete Anodes
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Galvanic Systems
• Galvanic Jackets
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Galvanic Jackets
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Galvanic Systems
• Bulk Anodes
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Bulk Anodes
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Galvanic Systems
• Metalizing
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Metalizing Spray
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Port of CanaveralNorth Cargo Pier Repairs
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North Cargo Piers• 700 - Galvanic Jackets, with bulk anodes• 50,000sqft - Metalizing on Precast Deck Units• 5000 ft - Strip Anodes in Pile Caps
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Galvanic Jacket – Port Canveral
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Galvanic Jacket – Port Canveral
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Galvanic Jacket – Port Canveral
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Bulk Zinc Anode - Port Canveral
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Galvanic Jacket – Port Canveral
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Galvanic Jacket – Port Canveral
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Strip Anodes – Port Canveral
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Strip Anodes – Port Canveral
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Strip Anodes – Port Canveral
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Metalizing Spray – Port Canveral
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Metalizing – Port Canveral
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Metalizing – Port Canveral
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Metalizing – Port Canveral
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Metalizing – Port Canveral
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Strip Anodes - Deck
• Elevated Slab• Near Gulf Coast• Chloride Contamination
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New ConstructionCataño Ferry Terminal
San Juan
• Old Terminal was 35 years old• New - 240 feet x 312 feet wide• 4600 passengers a day• Completed in 2012• Met U.S. Green Building
Council Requirements
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Discrete Anodes New Construction
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Summary
• Galvanic or Impressed Current Systems• Targeted or Global Protection• Restoration and New Construction• Service Life of system can be adjusted
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?QUESTIONS
Thank YouJason Chodachek