INCORR High Silicon / Chromium / Cast Iron Anodes are suitable for applications in aggressive acidic or alkaline soils and seawater environment. They are highly used in place of high silicon / iron.

For Si/Cr/Fe anode, a layer of oxide film by Si & Cr will form when the anode is used anodically. This oxide layer makes Si/Cr/Fe anode corrode very slowly and also make it suitable for use in seawater, soil of acidic and alkaline environment. If no chromium is added to the silicon / iron anode, the silicon oxide layer formed is porous (50% approx.) and wastage of the anode materials due to pitting when used in seawater will occur.

The disadvantages of Si/Cr/Fe anode is that it is brittle and should be handled with care during installation.

In order to reduce the Si/Cr/Fe anode to field resistance, and the consumption rate, etc., the Si/Cr/Fe anode is usually prepacked in coke breeze. Again, many types of carbonaceous backfill materials may be used such as coke breeze backfill, calcined petroleum coke breeze and natural or man made graphite particles.

In some occasions, the coke breeze are backfilled in trench or in deep hole such as deepwell groundbed.


Element Composition (Weight %)
Silicon 14.25 to 15.25
Manganese 1.0 max.
Carbon 1.4 max.
Chromium 4.0 to 5.0
Iron Balance


Anode Type Packing Nett anode weight (kg) Prepackaged weight (kg) Anode length L (mm) Anode diameter (mm) Canister length LP (mm) Canister diameter P (mm)
IS-23 Bare 23 - 1524 50 - -
IS-50 Bare 50 - 1524 75 - -
ISP-23 Prepackaged 23 75 1524 50 2000 203
ISP-50 Prepackaged 50 100 1524 75 2000 203

Note: Weight and dimensions are nominal. All anodes fitted with standard 6m x 16mm XLPE/PVC copper cable. Other cables and sizes are available on request.


Environment Current density (Amps/m) Consumption rate (kg/Amp-yr)
Fresh water 10 0.11
Sea water 15 0.31
  50 0.47
Sea water 200F 10 0.41
Buried sea water / sand 8 0.68
Carbonaceous backfill 15 0.10


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