Silicon Iron Anodes are commonly used in fresh water, seawater, or underground applications, possessing excellent resistance to corrosion within a wide variety of environments. They have been widely used within the Cathodic Protection Industry for over 30 years, giving them a fully proven performance record.

With Silicon Iron Anodes’ low specific resistance, suitability for fresh water, sea water and deep grounded installations, as well as their proven low consumption rate and dependability, their position as the number one choice for Cathodic Engineers is well deserved. We can also supply the following materials alongside any anodes order: Metallurgical Coke Backfill, Calcinated Petroleum Coke Backfill, Steel Canisters, Complete range of Anode Cables.

Critical to their dependability are the manufacturing methods and quality controls that are enforced by the Foundry responsible for their manufacture. Silicon Iron Anodes should adhere to a quality Level 1 or Level 2 so that premature or catastrophic failure of anode systems is prevented. With over 20 years’ experience in manufacturing Silicon Iron Anodes, at Specialist Castings we are able to provide anodes to a quality level that is unsurpassed throughout the globe with a typical quality of between Level 1 and 2. The x-rays below show ASTM Standard E186 (Vol II) from Level 1 down to Level 5 and illustrate the impact of low quality anode production.

Silicon Iron Anode
Level 1/2 - No porosity or gas visible.
Silicon Iron Anode
Level 4 - Gas porosity clearly visible as dark 'specks'. This will lead to premature failure of Anode System.
Silicon Iron Anode
Level 5 - Misalignment of Anode Core and calamitous shrinkage cavities clearly visible.

1.  Composition

Stick anodes are available with or without a chrome additive. This chrome additive enhances the performance of the anode system and is usually accepted as standard.

silicon iron anodes composition

2.  Connection

Cables are connected to anodes in one of three ways. Either a standard taper-pin connector is used or a light bulb recess is incorporated into the head of the anode. Both connection processes have proved themselves equally reliable over many years.

A further connection process that is similar to the taper-pin connector replaces the taper-pin with a threaded nut and bolt arrangement. This has also proved itself as a most reliable connection process. We at Specialist Castings will obviously respond to individual requests concerning the choice of connector.

silicon iron anodes connection

3.  Sizes Available

The following sizes are available as standard:-

silicon iron anodes
silicon iron anodes

Nominal (±5%)
* Parallel Anode with no expanded head specifically manufactured for Durichlor 51 Company U.S.A.

4.  Consumption Rates

For design purposes, a current density of not more than 30 amperes per square metre of anode surface is advised, although consumption rates of the anode is very low.

Typical rates are:- Normal – 0.5 Kg/ampere year
Chrome – 0.2 Kg/ampere year


Tubular Anodes

Tubular anodes have dense small projections throughout the entire anode surface so they can provide at least 20% more surface area than other conventional anodes. The increased surface area means low current density at certain current out or higher current out …

Stick Anodes

Solid Stick Anodes are a type of Silicon Iron Anode and are chill cast in metal moulds. This guarantees a rapid solidification as chill-casted anodes have excellent grain structure than normal sand cast anodes which provide better performance to corrosion protection. As …