Solent Anodes


US Military Specification A-18001K


Iron FE 0.005%
Cadmium CD 0.025-0.07
Copper CU 0.005 max
Aluminium AL 0.1-0.5
Lead PB 0.006 max
Others Total 0.1 max
Zinc ZN Remainder

Potential  1.05 V silver/silver reference cell

Capacity- 780


The current U.S. Military Specification, A-18001K, is the result of  work carried out by scientists for more than five decades. Before the mid 1950s, corrosion prevention was not fully understood with dramatically different results from similar vessels treated with apparently the same Zinc Anode protection.

Investigations into why only some of these vessels suffered from extensive corrosion indicated that some Anodes became passivated when a white crust formed on their surface . The crust was tested as Oxides of Iron and was determined to have been caused by excessive impurities in the product, mainly Iron. The formation of the crust made the Anodes inactive allowing corrosion to take place elsewhere in the vessel.

The first US military specification resulted, which limited the number of impurities in the Zinc used, resulting in the requirement to use high grade Zinc and strict manufacturing practices.

The specification has been refined over the years with the result that modern anodes manufactured to the specification should remain active throughout there lives by producing a thin zinc oxide film which will easily slough off.


Passivated Anodes                                          

Anode with tell tale signs of passivation                                 Passivated Anode that will not work


We are an online retailer specialising in supplying high quality Anodes for leisure and Commercial vessels.

We hold in stock the majority of our large range of products enabling a quick delivery, often dispatching on the same day.