Lead–silver anodes are designed for marine applications, particularly vessel protection. A stable, insoluble lead oxide film must form and remain on the anode surface. Lead is therefore alloyed with metals that stabilise this film.
Lead–silver anodes are designed for marine applications, particularly vessel protection. A stable, insoluble lead oxide film must form and remain on the anode surface. Lead is therefore alloyed with metals that stabilise this film.
The surface film distributes current, while the lead acts only as a conductor and a source of lead oxide.
Lead-based anodes fall into two groups by chemical composition:
A. Lead-based anodes containing silver Type A
B. Lead-based anodes containing silver and antimony Type B
Chemical Composition of Lead Based Anodes to MIL-A-23871A
| Element (Wt%) | Chemical Composition | |
| Type A alloy | Type B alloy | |
| Silver | 1.90-2.10 | 0.95-1.05 |
| Antimony | – | 5.5-6.5 |
| lead | Minimum 99.5 | Minimum 99.5 |
Their low corrosion rate and high current output make lead–silver anodes suitable for vessels and marine structures such as jetty supports and piles. They are made in different shapes and, depending on shape and weight, are either suspended underwater by ropes or mounted beside the protected structure using special supports.
Borna Electronic can design and manufacture lead–silver anodes to meet customer requirements or project needs.