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Stop gambling with rough, low-purity anodes that dissolve unevenly and leave your boat's metalwork exposed. This 5-piece pack of precision-cast zinc-aluminium alloy anodes, manufactured to a 99.99% zinc purity standard, delivers reliable cathodic protection for steel hulls, propeller shafts, rudders, and dock structures. Each block measures 80 mm long, 30 mm wide, and 12 mm thick, providing substantial sacrificial mass. The smooth, uniform surface indicates a clean pour with minimal impurities—unlike cheaper blocks that pit and crumble prematurely. Sold in a convenient 5-pack, you'll have enough anodes to cover multiple mounting locations or several scheduled replacements, saving you time and shipping costs. Choose between the weld-on style for direct hull attachment or the bolt-on version with pre-drilled mounting holes—specify your required hole spacing when ordering. Ideal for saltwater boats, freshwater vessels, cooling towers, underground pipelines, and any submerged steel structure.
| Material | Zinc-Aluminium Alloy (Grade 0# Zinc, 99.99% purity) |
| Single Anode Dimensions | 80 × 30 × 12 mm |
| Pack Quantity | 5 pieces |
| Approx. Total Pack Weight | 0.97 kg (weld-on) / 0.96 kg (bolt-on) |
| Mounting Options | Weld-on (flat back) or Bolt-on (pre-drilled holes – specify hole spacing & diameter) |
| Application | Cathodic protection for steel structures in seawater & freshwater |
| Suitable Environments | Saltwater, brackish water, freshwater, underground, and cooling towers |
| Package Includes | 5 × zinc-aluminium sacrificial anodes (select weld-on or bolt-on style) |
A: Standard zinc anodes sometimes use recycled or lower-grade material that contains impurities like iron, which can cause the anode to develop a passive oxide film and stop working. This 99.99% pure zinc-aluminium alloy maintains active, predictable corrosion performance, especially in both seawater and freshwater, where regular zinc can struggle.
A: Choose weld-on for permanent attachment directly to steel hulls, rudders, or large structures where you have welding access. Choose bolt-on for removable installations on propeller shafts, through-hull fittings, or locations where periodic replacement requires unbolting. For bolt-on orders, please provide your required hole spacing and bolt diameter in the order notes.
A: Clean the steel surface to bright bare metal using a wire brush or grinder. Remove all paint, rust, and scale. The anode must make direct electrical contact with the structure it's protecting. If bolting, use stainless steel hardware and consider a star washer between the anode and the structure for a positive bite.
A: At 80×30×12mm each, and with a 5-piece pack, you have a solid supply. In saltwater, inspect every 3-6 months and replace individual anodes once they are roughly half consumed. For trailered boats, the entire pack could last multiple seasons. For continuously docked vessels, one pack can provide over a year of protection depending on water conditions and how many anodes are installed at once.
A: Yes. The zinc-aluminium alloy composition is effective in both seawater and freshwater. For cooling towers, water treatment tanks, and underground pipelines, the bolt-on version allows straightforward attachment to steel components that would otherwise corrode rapidly.
