Product Data Sheet Show all documents

Sika® FerroGard®-420 Patch CC

Discrete anode for corrosion control, containing 198 g zinc

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 and/or carbonation. Sika® FerroGard®-420 Patch CC discrete anodes are placed into sound concrete that may be carbonated or chloride-contaminated, at the edge of repaired areas. Once installed, the Sika® FerroGard®-420 Patch CC anodes will corrode preferentially to the surrounding reinforcement, offering protection against corrosion damage.

  • 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 any time during the treatment
  • Conforms to the latest EN 12696 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 cartridge of embedding mortar available separately
  • No need to break-out large areas of sound contaminated concrete
* Dependent on local conditions, including chloride concentration, concrete properties, humidity and temperature.
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Product Data Sheet Show all documents

Usage

Sika® FerroGard®-420 Patch CC is used for:
  • Corrosion control of zones within sound contaminated concrete
  • 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
Please note:
  • The Product may only be used by experienced professionals.
  • Design of the galvanic protection system must be undertaken by a qualified, experienced corrosion design engineer.
  • Installation must be carried out in accordance with engineer's design and specification.
 

Advantages

  • 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 any time during the treatment
  • Conforms to the latest EN 12696 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 cartridge of embedding mortar available separately
  • 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.

Dimensions

Zinc content

Holes dimensions

180g

110 mm L x 18 mm Ø

Length

~115 mm

Diameter

~18 mm

Zinc weight

~198 g
System information

System structure

The installation mortar is Sika® FerroGard®-500 Crete for the following anodes:

Product

Length

Zinc content

Sika® FerroGard®-410 Patch CC

~42 mm

~65 g

Sika® FerroGard®-415 Patch CC

~77 mm

~120 g

Sika® FerroGard®-420 Patch CC

~115 mm

~198 g
Technical Information

Current density

> 0.2–2 mA/m² in corrosive environment

This value is dependent on local conditions, including chloride concentration, concrete properties, humidity and temperature.

Application

Application Information

Ambient air temperature

Minimum

+5 °C

Substrate temperature

Minimum

+5 °C

Hole dimension

Depth

~145 mm

Diameter

~25 mm
Application steps

SUBSTRATE PREPARATION

Concrete repairs must be undertaken in accordance to an acknowledged national standard such as EN 1504.

Any cracks or delamination in the concrete which affect ionic current flow will affect the performance of the Sika® FerroGard®-420 Patch CC unit. Pre-treat cracks and delamination before anode installation.

 

APPLICATION

IMPORTANT

Strictly follow installation and maintenance procedures

Strictly follow installation and maintenance procedures as defined in Method Statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

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

Reference must be made to the Sika Method Statement: Corrosion Control using Discrete Galvanic Anodes Sika® FerroGard®-400s Patch CC. The following is a summary.

  1. Position the anodes at a density of 4–9 per m² of surface concrete. The spacing between the anodes is 350–650 mm.
  2. Drill the holes with a diameter and depth according to the Hole dimensions in Application information.
  3. Fill the holes with Sika® FerroGard®-500 Crete embedding mortar to completely encapsulate the anode.
  4. Insert the anodes into the embedding mortar.
  5. Electrically connect each anode to a titanium feeder wire which is connected to the reinforcement. Note 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.
  6. Use a Sika low-shrink repair mortar to cover the patch to a minimum thickness of 20 mm. When installed in an existing concrete repaired area, the resistivity of the repair mortar must be in the range of 50–200 % of the parent concrete.

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

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