Multipurpose Segmented Sacrificial Anodes  

One of two major Cathodic Protection (CP) methods utilized in industry is the application of sacrificial anodes. The most common active metal alloys utilized for sacrificial anodes are magnesium, zinc, and aluminum.

1. Magnesium Alloys
   • Pure magnesium alloys: 1.75 V driving voltage.
   • Standard magnesium alloys: 1.55 V driving voltage.
2. Zinc Alloys
   • Zinc is the oldest active metal utilized for sacrificial anodes.
3. Aluminum Alloys
   • Aluminum is an active metal that immediately forms an aluminum oxide (alumina) layer on its surface when exposed to corrosive environments. The oxide layer behaves like a protective coating, creating a physical barrier between the alloy surface and the environment. Therefore, pure aluminum cannot be utilized as a sacrificial anode.

Sacrificial Anode Material Selection Process

Magnesium sacrificial anodes should be selected under the following conditions:

• Electrolyte pH greater than 5.
• Concentration of chloride ions is not considerable.
• Liquid resistivity is greater than 2,000 Ω-cm.
• For resistivities greater than 5,000 Ω-cm, high-potential magnesium alloys should be selected.

Zinc sacrificial anodes should be selected under the following conditions:

• Concentration of carbonates and bicarbonates is not considerable.
• Temperature is less than 120°F (50°C).

Application..

According to all enclosed technical information, the advantages of utilizing Ucorr® MSS Anodes with respect to conventional anodes are prioritized as follows:

1. The current output and resistance of each MSS Anode type can easily be adjusted based on design requirements. In other words, the design engineer can easily customize integrated MSS Anodes as desired.
2. Significant cost reductions associated with installation, maintenance, and replacement, especially replacement of anodes in liquid applications.
3. Reduces cost of supplying anodes up to 30%.
4. Minimizes damage to protective coatings and structures due to minimal welding requirements for liquid applications.
5. Increases strength/reliability of electrical/mechanical connections.
6. Reduces drilling requirements in soil applications due to capability of adjusting anode surface area/weight, which minimizes required drilling locations and subsequently, land acquisition costs.
7. Reduces costs of production, storage, and transportation.

This invention was registered in 2014 (US Patent No. 8828195B2). All intellectual property rights of this invention belong to Omidreza Moghbeli. In accordance with executed contracts, the copyrights are controlled by Universal Corrosion Services, LLC and Ucorr Innovative Solutions, Inc.