CMP Anodes/Zincs

CMP Martyr Anodes & Zincs: Industry-Leading Cathodic Protection

When it comes to defending your boat from the relentless threat of galvanic corrosion, few names carry as much weight as CMP (CMP Group) and their renowned Martyr Anodes line. Anodes and zincs are the unsung heroes of marine maintenance — sacrificial metal components that corrode in place of your boat's propellers, shafts, rudders, hull fittings, and drive components. CMP has built its reputation over decades by engineering anodes that do this job better than almost anyone else in the industry.

Who Is CMP and Why Do Their Anodes Matter?

CMP Group's history runs deep in the marine world. With roots dating back to the early 1900s, CMP has grown from a local foundry into what is widely recognized as one of the world's largest producers of die-cast marine anodes. Their Martyr brand is the product of that long heritage, combining precision manufacturing with rigorous quality controls that few competitors can match.

What sets CMP's Martyr anodes apart starts on the factory floor. Each anode is pressure die-cast and manufactured under an ISO 9001 Quality Management System — the same quality standard demanded in aerospace and medical manufacturing. Every alloy batch is chemically tested in CMP's in-house labs to ensure consistency, and each product is engineered to meet or exceed the latest US Military Alloy Specifications, including MIL-DTL-18001(L) for zinc and MIL-DTL-24779C(SH) for aluminum. CMP is among the very few manufacturers fully compliant with these updated Mil-Spec standards.

Three Alloys for Every Water Type

One of the most practical advantages of choosing CMP for your anode needs is their complete three-alloy system under the Martyr lineup:

• Martyr I (Zinc) — The traditional choice for saltwater environments. Zinc anodes are proven performers in high-conductivity marine waters.
• Martyr II (Aluminum) — Engineered for saltwater and brackish water. Aluminum anodes are increasingly recommended as a more environmentally responsible alternative, since traditional zinc can contain cadmium, which poses risks to marine ecosystems.
• Martyr III (Magnesium) — The only alloy proven to provide effective cathodic protection in freshwater environments, where zinc anodes are largely ineffective.

CMP is committed to guiding the marine industry toward more sustainable practices, actively advocating for aluminum and magnesium anodes to help protect both vessels and waterways.

Complete Coverage for Your Vessel

The Martyr product line covers virtually every metal component on a boat that needs protection. From shaft collar anodes and hull plate anodes to trim tab anodes, rudder anodes, and pencil-style engine anodes, CMP offers precision die-cast fitment for a wide variety of vessel types. Pre-packaged engine kit anodes are also available for popular outboard and sterndrive brands — including Yamaha, Mercury, Volvo, and MerCruiser — with all necessary fasteners included for straightforward installation. Whether you are equipping a small recreational runabout or maintaining a commercial vessel, CMP's Martyr lineup provides targeted, reliable galvanic protection at every critical point below the waterline.