They are made from a metal alloy with a more "active" voltage (more negative electrochemical potential) than the metal of the structure. The difference in potential between the two metals means that the galvanic anode corrodes, so that the anode material is consumed in preference to the structure.
The loss (or sacrifice) of the anode material gives rise to the alternative name of sacrificial anode.
We stock sacrificial anodes in Zinc and Magnesium. Anodes are designed to dissolve over time and deter the actual erosion and chemical attack of the critical metal components. Sacrificial anodes are designed to coat the metal surfaces as they dissolve and attract the aggressive chemicals and or electrolysis to the anode instead of the unit they are installed on. Just like the anodes on the stern of a boat, they provide a place for erosion to attack instead of the boat hull or propeller shafts etc.
- We carry Zinc and Magnesium anodes in pencil-donut and brick sizes.
- Pencil anodes are typically ½-3/4 npt brass plugs with a 4-8” pencil on them.
- Donuts are typically 3-4-5 and 6” in diameter with ½ “ hole Galvanized inserts for mounting on a stainless steel stud.
- Magnesium bricks are usually 4” or 8” square x 3-4” thick with a 3/4” id insert.
- We stock all sizes at our facility and can usually ship them in 1-2 business days.
Please give one of our sales reps a call to order your anodes.