Galvanic Anodes

Galvanic Anodes

Galvanic anodes, also known as sacrificial anodes, provide proven, maintenance-free corrosion prevention for steel structures buried in soil or submerged under water. MATCOR manufactures and supplies high-quality aluminum, zinc, and magnesium sacrificial anodes engineered for pipeline, tank, and marine applications.

Galvanic Anodes Key Benefits

No external power needed
Low maintenance and long-lasting
Reduces stray current interference
Ideal for remote locations
Lower total cost ownership

Galvanic Anodes Components

Anode Materials

  • Magnesium: for high-resistivity soils and freshwater; available in high-potential and standard-potential alloys
  • Zinc: for brackish and seawater; not recommended for high-temperature or high-resistance environments
  • Aluminum (including Galvalum III): for marine and offshore environments; Galvalum III offers higher potential for demanding applications

Configurations

  • Bare metal anodes: direct attachment where metal-to-metal contact is required
  • Packaged anodes in backfill: ideal for underground installations
  • Anodes with mounting straps: easy to attach to pipes, ships, or tanks
  • Ribbon anodes: flexible for long or irregular surfaces
  • Rod and special-shaped anodes: custom-designed for unique installations

Backfill Materials

  • Magnesium anodes: 75% gypsum, 20% bentonite, 5% sodium sulfate
  • Zinc anodes: 50% gypsum, 50% bentonite

Galvanic Anodes Specifications

Anode Type Typical Potential (V/CSE) Efficiency (Utilization Factor) Typical Environment
Magnesium (Standard) -1.75 ~50% High-resistivity soils, freshwater
Magnesium (High Potential) -1.55 ~50% Moderate-resistance environments
Zinc -1.1 90-95% Brackish/seawater, low-resistance soils
Aluminum Not specified in source 85-90% Marine/offshore
Aluminum (Galvalum II) -1.1 to -1.15 85-90% Marine/offshore, high performance

Galvanic Anodes Design

Applications

  • Underground pipelines and infrastructure
  • Marine structures: docks, jetties, ship hulls, offshore platforms
  • Tanks and vessels: internal protection
  • Industrial systems in harsh, corrosive environments

Design Considerations & Limitations

  • Lower driving force compared to impressed current systems
  • Shorter service life in certain applications
  • May not be suitable for some acidic environments
  • Not ideal for high-resistance environments above 10,000 ohm-cm
  • Difficult to adjust output once installed

Alternatives

Impressed current anodes offer more control over output and a longer design life.

Galvanic Anodes Ordering

Whether you need stand-alone galvanic anodes or custom assemblies integrated into a larger cathodic protection system, MATCOR’s experts can help you select the right solution for your environment and service life requirements.

Why MATCOR Materials?

MATCOR engineers and manufactures proprietary cathodic protection products in the USA, combining proven field performance with the quality systems and supply chain control that critical infrastructure demands.

Made in the USA, Built for the Field

Proprietary products manufactured in-house with millions of documented operating hours and reliable domestic supply chain control.

Engineered To Perform, Not Just Comply

Products designed by our own corrosion engineers to solve real-world problems, not just meet spec.

Proven Quality Systems

ISO 9001:2015 certified manufacturing with structured quality control and built-in continuous improvement processes.

Backed by Global Resources

The specialized expertise of a corrosion engineering company combined with the systems and oversight of a $6B global industrial services organization.

From application review to delivery and field support, getting the right CP and AC mitigation materials is an engineering decision—not just a purchase. Here’s what working with MATCOR looks like.

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 Related services

MATCOR’s conceptual cathodic protection design services help you evaluate your options — our engineers gather application details, conduct on-site testing as needed, and present the impressed current or sacrificial CP systems that fit, along with benefits, approximate costs, and ongoing maintenance requirements. Backed by 45 years of experience, you get comprehensive options without the guesswork.
MATCOR technicians visit your site to collect the electrical transmission, pipeline, and soil resistivity data needed to evaluate fault current and induced AC corrosion risks and identify safety hazards per the latest NACE and industry standards. This field data feeds MATCOR’s AC modeling process, supporting effective AC mitigation system design.
AC interference modeling uses sophisticated software to analyze safety and corrosion risks — step-touch potential, induced AC, and shorted or fault conditions — for pipelines sharing right-of-way with overhead electrical transmission lines. MATCOR provides field data collection and complete AC modeling and analysis to determine interference risks and design the right AC mitigation system.
A cathodic protection anode bed is commonly used to protect pipelines, well casings, water systems, and other large infrastructure assets where current must be distributed over a broad area.

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