Pier & Pilings Anodes

Precision-Cast Cathodic Protection

Pier & piling anodes are used on seawalls, piers, pilings, and other marine structures to provide reliable, long-term cathodic protection in harsh environments.
At Purity Casting Alloys, we manufacture high-quality aluminum (MIL-A-24779) and zinc (MIL-A-18001K) anodes, built to perform and backed by consistent in-house quality control. Core options include flat bar steel, steel pipe, threaded rod, eye bolts, and galvanized cable—giving you the flexibility to match your installation requirements.
Every anode is custom made to order, ensuring the right fit for your project. Whether you need a standard design or a fully custom solution, we’ll work with you to deliver exactly what’s required—without unnecessary delays or complications.
We meet or exceed industry standards and take pride in producing reliable, consistent product you can count on. Lengths can be adjusted within the constraints of our molds, allowing for efficient production while still accommodating project-specific needs.

Built to Spec. Verified In-House.

Every heat of aluminum and zinc anode alloy is sampled and analyzed in our in-house laboratory before casting, helping ensure consistent chemistry from anode to anode.

Why Purity Tests Every Heat →

Zinc vs. Aluminum

What's The Difference?

Zinc (MIL-A-18001K)

Zinc is the ideal sacrificial anode when a vessel is docked or anchored in seawater for extended periods.
Unlike other metals, zinc is better at shedding film buildup, continuously exposing fresh zinc to the water and keeping the anode electrochemically active. Aluminum anodes, in contrast, can develop a crust that passivates the anode, making it less effective.
The longer a vessel sits idle, the greater the risk of anode passivation. However, when the vessel is moving, the water flow helps clean off the oxide layer and reactivate the anode, regardless of the metal type.
For vessels that are regularly active in saltwater, both zinc and aluminum anodes work well. But if a boat remains stationary for extended periods in saltwater, zinc anodes are the better choice.

Aluminum (MIL-A-24779)

The Advantages of Aluminum Anodes
Many manufacturers and boaters prefer aluminum anodes over zinc or magnesium for several reasons.
Aluminum has become more affordable in recent years, making it a popular choice for installing sacrificial anodes on vessels, engines, and other equipment.
Aluminum anodes protect effectively in saltwater, perform better in upper brackish water, and decently in freshwater, but they tend to develop an oxide coating (passivation) faster than zinc. Regular cleaning prevents this, ensuring aluminum anodes remain effective.
EPA reports indicate that magnesium and aluminum anodes are more environmentally friendly than zinc, though the environmental impact of zinc is minimal.

Planning a Cathodic Protection Project?

Whether you already have an engineered CP design or aren’t sure what anodes your structure requires, we’ll help you find the right next step.

Ready to Order?

I have an anode spec, drawing, existing design, or know what anodes I need.

How to order a custom anode →

I Need a Cathodic Protection Design

I know my structure needs cathodic protection, but the anode requirements haven’t been determined.

Not Sure What Anodes You Need?

Learn what information is needed for a CP project what Purity can help with and when a corrosion engineer is required.

Where Purity Fits In

Corrosion Engineer

Determines:

Purity Casting Alloys

Manufactures:

Cathodic Protection Design → Anode Manufacturing

Need a Corrosion Engineer?

If your project’s cathodic protection requirements haven’t yet been established, we can help connect you with an experienced corrosion engineering firm.

Get A Custom Anode Solution

We specialize in tailored solutions for your industrial needs.

Pier & Pilings Anodes

Alloy Types

Weight Range

Core Types

Compliance