Product Data Sheet Show all documents

Sika® FerroGard®-420 Patch CC

Discrete anode for corrosion control

Sika® FerroGard®-420 Patch CC is a zinc based discrete sacrificial anode placed in reinforced concrete structures which are corroding as a result of chloride ingress or carbonation.
Sika® FerroGard®-420 Patch CC discrete anodes are placed into sound carbonated or chloride contaminated concrete outside of any concrete repaired areas.
Once installed, the Sika® FerroGard®-420 Patch CC anodes will corrode preferentially to the surrounding reinforcement, offering protection against corrosion damage.

  • Sika® FerroGard®-420 Patch CC anodes corrode preferentially to the surrounding reinforcement, offering protection from further corrosion damage.
  • No long term maintenance costs 
  • Option to deliver an electrical charge to the reinforcement anytime during the treatment
  • Conforms to the latest EN 12696 (2012) standard for impressed current cathodic protection, when designed appropriately
  • Large charge capacity of up to 500 kC with option of sizes.*
  • Lifetime of up to 20 years*
  • Rapid and targeted installation
  • Performance can be monitored
  • Pre-packaged embedding mortar
  • No need to break-out large areas of sound contaminated concrete
 *   Dependent on local conditions, including chloride concentration, concrete properties, humidity and temperature.
Product Data Sheet Show all documents

Usage

  • Corrosion control of zones within sound contaminated concrete.
  • For reinforced concrete structures such as bridges, car parks, coastal structures, industrial structures and residential high rise.
  • Coastal reinforced concrete structures both in and above the tidal zone
 

Advantages

  • Sika® FerroGard®-420 Patch CC anodes corrode preferentially to the surrounding reinforcement, offering protection from further corrosion damage.
  • No long term maintenance costs 
  • Option to deliver an electrical charge to the reinforcement anytime during the treatment
  • Conforms to the latest EN 12696 (2012) standard for impressed current cathodic protection, when designed appropriately
  • Large charge capacity of up to 500 kC with option of sizes.*
  • Lifetime of up to 20 years*
  • Rapid and targeted installation
  • Performance can be monitored
  • Pre-packaged embedding mortar
  • No need to break-out large areas of sound contaminated concrete
 *   Dependent on local conditions, including chloride concentration, concrete properties, humidity and temperature.

Packaging

25 anodes per box, vacuum packed in 5 separate pouches

Colour

Cylindrical zinc core covered in an activated coating, separate white spacers and an integral titanium connecting wire.

Product Details

Product Information

Composition

Zinc compound

Shelf life

5 years from the date of production.

Storage conditions

Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging. Do not allow contact with oxidizing materials. Pouches must only be opened when product is required. Any part used pouches must be re-sealed.

 

Length

~115 mm

Diameter

~18 mm

Zinc weight

~180 g
System information

System structure

Sika® FerroGard®-420 Patch CC  

Sika® FerroGard®-500 Crete

Other anode sizes are available with different zinc contents and profile:

Name

Zinc content

Sika® FerroGard®-410 Patch CC

~65 g

Sika® FerroGard®-415 Patch CC

~120 g
Technical Information

Current density

>0,2–2 mA/m2 * in corrosive environment.

*   Dependent on local conditions, including chloride concentration, concrete properties, humidity and temperature.

Application

Application Information

Hole dimension

Depth: 145 mm

Diameter: 30 mm

Ambient air temperature

+5 °C min

Substrate temperature

+5 °C min
Application steps

APPLICATION

Reference must be made to the full Method Statement which is summarised below:

Sika® FerroGard®-420 Patch CC anodes are installed following guidelines in EN 12696:2012 and CEN/TS 14038-1:2004.

The anodes are typically positioned at a density of 4–9 /m2 of surface concrete; spacing between anodes: 350–650 mm - refer to the relevant Method Statement for details.

Install into pre-drilled (30 mm diameter holes with a depth of ~145 mm) previously filled with Sika® FerroGard®-500 Crete embedding mortar to completely encapsulate the anode.

Electrically connect each anode to a titanium feeder wire which is connected to the reinforcement. This allows an option to deliver an electrical charge to the reinforcement at any point in the future should a change in environmental conditions demand greater protection of the reinforcement. In this situation, Sika® FerroGard®-420 Patch CC system conforms to the latest EN 12696:2012 standard for impressed current cathodic protection.

The Sika® FerroGard®-420 Patch CC anode installation can be monitored using half-cell potential surveys, current outputs and reinforcement corrosion rate measurements.

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