Product Data Sheet Show all documents

Sika® FerroGard®-320 Duo

Hybrid anode for corrosion mitigation

Sika® FerroGard®-320 Duo is a hybrid anode based on a dual technology which combines Impressed Current Cathodic Protection and Galvanic Cathodic Protection systems. Sika® FerroGard®-320 Duo discrete anodes are placed into sound but chloride contaminated concrete outside of any concrete repaired areas. The anodes work in 2 phases: 1st phase - an impressed current is driven from the Sika® FerroGard®-320 Duo anodes to the steel using a temporary power supply. During this stage, the reinforcement’s passive film is strengthened and aggressive ions are drawn away. 2nd phase - at the end of the 1st phase the power is removed. The anodes then act as a long-term sacrificial anode preventing further corrosion.

  • No long-term power supply needed
  • A variety of sizes to suit the structure and life expectancy
  • Initially delivers an impressed current using a temporary power supply
  • Creates a passive environment during impressed current activation, draws aggressive ions to the anode and the passive film is strengthened around the reinforcement.
  • Acts as a sacrificial anode without the requirement for an external power supply
  • No long-term maintenance
  • Further passivating charge can be applied if required.
  • Minimal long-term costs
  • Performance can be monitored
  • Cost effective long-term durable corrosion control solution
  • No risk of hydrogen embrittlement (Design dependant)
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Product Data Sheet Show all documents

Usage

  • Targeted or global protection of reinforced concrete structures suffering corrosion damage induced by chlorides and/or carbonation.
 
  • For reinforced and pre-stressed concrete structures such as bridges, car parks, coastal structures, industrial structures and residential high rise.
  • The treatment of pre-stressed elements, such as bridge beams. This is a unique feature of Sika® FerroGard Duo anode system as there is no risk of hydrogen embrittlement when designed properly.

Advantages

  • No long-term power supply needed
  • A variety of sizes to suit the structure and life expectancy
  • Initially delivers an impressed current using a temporary power supply
  • Creates a passive environment during impressed current activation, draws aggressive ions to the anode and the passive film is strengthened around the reinforcement.
  • Acts as a sacrificial anode without the requirement for an external power supply
  • No long-term maintenance
  • Further passivating charge can be applied if required.
  • Minimal long-term costs
  • Performance can be monitored
  • Cost effective long-term durable corrosion control solution
  • No risk of hydrogen embrittlement (Design dependant)

Packaging

25 anodes per box

Colour

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

Product Details

Product Information

Chemical Base

Zinc compound

Shelf Life

5 years from the date of production

 

Storage Conditions

Product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging. Do not allow contact with oxidizing materials.

Length

~115 mm

Diameter

~18 mm

Zinc Weight

~180 g
System information

System Structure

  • Sika® FerroGard®-320 Duo  
  • Sika® FerroGard®-300 DuoCrete

Other sizes of anode are available with different zinc content and profile:

Name

Zinc content

Sika® FerroGard®-310 Duo

~65 g

Sika® FerroGard®-315 Duo

~120 g

Sika® FerroGard®-325 Duo~275 g
Sika® FerroGard®-330 Duo~365 g
Technical Information

Charge Capacity

>125 to 1000 kC*

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

Application

Application Information

Ambient Air Temperature

+5 °C min

Substrate Temperature

+5 °C min
Application steps

APPLICATION

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

Reference must be made to the Sika Method Statement: Corrosion Control using Sika® FerroGard®-300s Duo Hybrid Galvanic Anodes for further details. This is summarised below:

Sika® FerroGard®-320 Duo anodes are installed following the guidelines in EN 12696:2012 and CEN/TS 14038-2:2010 (E).

The anodes are typically positioned at a density of 4–9 /m2 of surface concrete. Spacing between anodes: 280–500 mm.

Install into pre-drilled (30 mm diameter holes with a depth of ~145 mm) previously filled with Sika® FerroGard®-300 DuoCrete activating and embedment mortar to completely encapsulate the anode.

Electrically connect each anode to a feeder wire which runs to the temporary power supply for the impressed current stage of the treatment (typically 1 week). During this period, the anodes will distribute ~50–500 kC/m2 steel surface.

After ~1 week (depending on site measurements), remove the feeder wire from the temporary power supply and connect to the reinforcement steel. In this final stage the anodes operate in a galvanic mode, maintaining the steel in a passive state.

The size of each treated area on a structure may be varied to suit the client's requirements.

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