Silicon Iron Anode
A silicon iron anode (hereinafter refers to Fe/Si/Cr) is a solid, non-porous material. This alloy consists of a matrix of silico-ferrite in which the majority of the carbon is in the form of graphite flakes at grain boundaries. Adding chromium results in eliminating graphite.
| Element | Content（Weight,%） | |
| Si | 14~16 | |
| Cr | 4.0~4.5 | |
| Mn | 0.6~0.8 | |
| C | 0.80~1.05 | |
| Fe | Remainder |
*comply with ASTM A518 Grade 3
| Tensile Strength | 103 | N/mm² |
| Compressive Strength | 689 | N/mm² |
| Brinell Hardness | 520 | HB |
| Density | 7 | g/cm3 |
| Melting Point | 1300 | ℃ |
| Coefficient Of Linear Expansion | 1.86×10-5 | 201/℃ (0-100℃) |
Each anode connect 100m 1×10 square meter HMWPE/SWA/PVC tail cableCast iron anodes are provided in end-connected configurations. Following the anode–to-cable connection, the annular space around the cable is filled with a high quality electrical sealant. Heat shrinkable anode caps are commonly used for additional protection. Cast iron anodes can be prepacked in steel canisters with carbonaceous backfill.
| A/mm | B/mm | C/mm | D/mm | Area/m² | Weight/kg |
| 50 | 1500 | 75 | 90 | 0.25 | 20.5 |
| 70 | 1500 | 50 | 90 | 0.25 | 28 |
The silicon iron anodes are used in aggressive acidic or alkaline soil and seawater environments. The performance of cast iron as an anode is dependent upon the formation of a thin layer of silicon dioxide on the surface of the anode. Oxidation of the alloy is necessary to form this protective film. Silicon-chromium cast iron is highly resistant to acid solutions. It does not perform particularly well in alkaline environments or in the presence of sulfate ions.