We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is a Magnesium Anode?

By Paul Scott
Updated May 16, 2024
Our promise to you
EasyTechJunkie is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At EasyTechJunkie, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

A magnesium anode is a galvanic or sacrificial corrosion prevention device connected to steel structures to prevent or slow down rusting. Magnesium anodes create an easier and more attractive source of oxidation than the steel structures they are connected to. In this way they are consumed by corrosion instead of the structure — hence the name sacrificial anode. A magnesium anode is typically made up of an alloy composite of magnesium and other metals. They are available in a selection of prefabricated designs and weights to suit a wide range of installation requirements.

The magnesium anode belongs to a group of corrosion protection devices known as galvanic or sacrificial anodes. These anodes are electrically connected to the surface of the steel work they protect by means of direct contact or a cable link. They are either left on the surface of the steel work or buried in the ground adjacent to the structure. They then offer corrosion protection by offering themselves up as a more attractive and direct source of oxidation than the steel structure and are slowly consumed or sacrificed in the process.

Magnesium anodes are typically available in two alloy compositions. The first is typically a combination of 90% magnesium, 6% aluminum and 3% zinc. The second is 99% pure magnesium which is better suited to dry or resistant soil conditions or where the steel work is poorly coated with other corrosion barriers. The magnesium anode is most commonly used to protect propane tanks, ship hulls, submarine pipelines, piers, and heat exchangers.

Mangnesium anodes are available in a range of designs. Each type is specifically crafted to offer different conductive properties and connection options to suit particular types of structures or environments. Hull anodes, for instance, are designed to flush mount against the hulls of ships, dams, or tanks via built in steel straps. Drive-in anodes, on the other hand, are designed to be driven into the ground to protect buried propane tanks or steel pylons. Specialist anodes such as condenser and ribbon types may feature plastic coatings to increase anode life or offer higher than normal current carrying capacity.

Magnesium anodes are also available in a range of sizes and with several packaging options. The most popular magnesium anode size is the 17 pound (7.7 kg) anode although they are available in sizes ranging from a couple of ounces to over 200 pounds (90 kg). Magnesium anodes are also frequently presented in a ready-to-use backfill package which consists of a degradable bag filled with an electrically conductive filling of powdered gypsum, bentonite clay, and sodium sulphate. The whole package is buried intact where the bag disintegrates over time. The filling eventually creates a good conductive layer around the anode which can ensure excellent results in resistive soils.

EasyTechJunkie is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.

Discussion Comments

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.

EasyTechJunkie, in your inbox

Our latest articles, guides, and more, delivered daily.