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Magnetite Anodes

Magnetite Anodes

MAGNETITE ANODES FOR IMPRESSED CURRENT CATHODIC PROTECTION SYSTEMS

MAGNETITE (Fe3O4 ) is a natural mineral with good conductivity and a high degree of oxidation that makes it resistant to corrosion even at high temperatures. When alloyed with small quantities of other minerals under controlled conditions, an anode with the optimal electrochemical properties and mechanical strength is produced.

Our magnetite anode is casted in hollow cylindrical forms to minimise weight and to facilitate cable to anode connections at the centre of the anode. This centre cable to anode connection allows for a uniform current dissipation at the anode surface.

The surface of the anode in the hollow centre is lined with a layer of lead of thickness and length to provide highly reliable current conduction between cable connector and anode.

The hollow annular space is filled with a dielectric compound after the cable connection is made and the ends of the anode are sealed with anode caps to prevent ingress of foreign matter.

  • Operates at high current densities.
  • Extremely low dissolution.
  • Not susceptible to ripple in d.c. supply.
  • No ceiling on d.c. voltage output.
  • Light weight and easy to install, remove for inspection and reinstall.
  • Centre cable to anode connection for even current distribution and consumption of anode surface.
  • Independent series of examinations and selections of castings for the making of the anodes.
  • The selection of anode caps and lead materials according to customers specifications and environmental conditions, is based on experience.
  • Impregnable anode cap connections with corrosion resistant material and a special welding process.
  • Special electrical resistance and potential tests to confirm uniform current dissipation without hot spots.
  • Controlled sealing of anode hollow annular space with selected dielectric compound.
Specific gravity
Brinell hardness (WB5/187.5/15)
Bending strength
Density
Melting point
Coefficient of linear expansion
4.7–4.8
344
5
4,71
1500
6.4x10-6
kg/dm3

kN/cm2
g/cm3
°C
1/°C (0-100°C)
FeO

Fe3O4

Balance
28 - 32%

60 - 64%

4 - 12%
Consumption rate

Current density 1)

Efficiency
0.02 kg/A year

0.70 mA/dm2

90%

 

TYPE: MA-U

 
Diameter 60 mm
Total lenght 720 mm
Effective length 670 mm
Total weight 6.0 kg
Min. effective mass 4.7 kg
Surface area 13.4 dm2
Max. current load 3.0 A
Surrounding electrolyte:
neutral soil and water without chlorine and sulfate
content
  Applications:
shallow groundbeds,
deep groundbeds
 

TYPE: MA-CS

 
Diameter 60 mm
Total lenght 760 mm
Effective length 710 mm
Total weight 6.0 kg
Min. effective mass 4.7 kg
Surface area 13.4 dm2
Max. current load 6.0 A
Surrounding electrolyte:
chlorine and/or sulfate
containing soil or stagnant
water
  Applications:
shallow groundbeds,
deep groundbeds
 

TYPE: MA-SEA

 
Diameter 60 mm
Total lenght 760 mm
Effective length 710 mm
Total weight 6.0 kg
Min. effective mass 4.7 kg
Surface area 13.4 dm2
Max. current load 16.0 A
Surrounding electrolyte:
flowing seawater or
brackish water
  Applications:
platforms, jetties,
harbours
 

TYPE: MA-CHAIN

 
Diameter 60 mm
Total lenght 740 mm
Effective length 600 mm
Total weight 6.2 kg
Min. effective mass 4.7 kg
Surface area 11.3 dm2
Max. current load (groundbeds) 6.0 A
Max. current load (tanks) 16.0 A
Surrounding electrolyte:
chlorine containing soil or
stagnant water
  Applications:
deep groundbeds open
hole, deep groundbeds
closed hole, water tanks
 

CANISTER FOR MA - U + MA - CS

 
COKE BACKFILL
Minimum carbon content 90%
Maximum moisture content 5%
Maximum resistivity 1Ωm
Density 700-950 kg/m3
Particle size (dia.) 20 mm max.
 
Standard canister Diameter (mm) Length (mm) Total weight (kg)
CAN 10 160 1000 22
CAN 15 300 1500 85
CAN 20 300 2000 110
 

 

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