Tank Cathodic Protection
Storage Tanks - Aboveground, Underground & Internal

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Cathodic Protection – Working to extend the life of critical structures

Tank storage of crude, petroleum, chemicals and other liquids provides a critical interface between production and transportation. Aging infrastructure and the risk of leakage and structural failure is an intolerable risk to terminal operators. This is why Corrosion Service focuses on providing tank cathodic protection designs, engineering, supply and field services to the tank storage industry in Canada and the United States of America.

Cathodic protection is the most common electrochemical technique used to prevent external corrosion on tank floors, and if the product chemistry is correct internal cathodic protection is simple to apply.

Systems come in a variety of configurations depending on the tank construction, which include; peripheral anodes, mesh anodes, existing floor anodes and carbon disc anodes. For the interior of the tank, rod or bar anodes are commonly used.

Cathodic Protection is accomplished by applying a direct current to the tank surface of the metal, which causes the electrochemical potential of the structure to shift from a corroding state to a polarized and non-corroding state.

Our team and the services that we offer

Tank cathodic protection systems can vary, and whether the project is new build, rehabilitation, or routine maintenance, our talented team of industry professionals is empowered to understand the unique characteristics of every enquiry. This is important because as an organization, Corrosion Service strives to provide the extremely high level of support and partnership necessary in order to create the customized solutions that our clients require on a daily basis.

Branch offices are strategically located throughout North America and are the primary line of contact for tank storage clients. Each branch office is designed to provide front line engineering expertise, project management support and field services in collaboration with our Toronto engineering hub that provides high level engineering and design services.

Team members are highly trained, with all engineering staff certified at various levels by the National Association of Corrosion Engineers International.


Our cathodic protection services include:

  • System Design
  • Annual Surveys
  • Material Supply
  • Existing Tank CP System Installation
  • New Tank CP System Installation
  • Remote Monitoring
  • System Audits
  • System Maintenance

System Profile Downloads

Please click on any of the below to receive an email allowing download capabilities for the below system profiles:

ZOx Aboveground Storage Tank (AST) Anode System - The Non-Depolarizing Anode System for Storage Tank Cathodic Protection

The ZOx anode system was developed by world renowned corrosion specialists to overcome the challenge of oxygen generation at the anode resulting in AST tank bottom depolarization.

With more than 20 years of proven field history, the ZOx anode system is fabricated from anode materials whose anodic reaction does not result in the generation of oxygen. This makes the ZOx anode system ideally suited for hot tanks and configuration with Low pH backfills now permitted by NACE SPO193-2006. The ZOx anode system is an improved anode design that lowers the anode current discharge angle, substantially improving current distribution to the AST tank floor.

Additionally, the ZOx anode system benefits from an extremely low resistance (<0.01 ohms). This low resistance results in negligible attenuation across the anode system, minimizing the number of feeder cables and dramatically reducing the total current required for protection. This reduced current reequipment means that less energy is required by a factor of 10 less than other systems, saving on your monthly energy bills.

U.S. Patent No.: 8,025,778 B2, Canadian Patent No.: 2,606,671

Service Profile - Design Services

System optimization is critical at the tank cathodic protection design stage to ensure the system components are selected, sized and strategically located to provide efficient current distribution for the tank asset to be protected.

Our long history of design and complete understanding of the electrochemical process, having designed thousands of tank AST or buried cathodic protections systems over the years for various clients in North America and around the world give our present and future clients the confidence in Corrosion Service.

Our Design teams consist of NACE trained and certified professionals having all the skills to complete the job. Our Engineering and Drafting services and as well support staff follow defined work flows that allow full exposure to internal and external auditors confirming system excellence prior to installation. Having established and documented work flows for the entire design process ensures our process is transparent and instills confidence that the designed system will exceed the clients expectation once installed for many years to come.

Service Profile - Installation Services

We have dedicated crews that are trained in the installation of tank cathodic protection systems. Projects range from installing a single sacrificial anode onto a coated underground day tank or providing large crews installing tank perimeter vertical wells or anode systems installed directly under the tank bottom as per the design requirements.

To ensure the work in is completed on budget and on time we own a fleet of construction equipment and have partnered with specialised prequalified contractors that have the required skills to assist us in completing the job.

Service Profile - System Commissioning and Annual Maintenance Survey

Efficiency and effectiveness of the tank cathodic protection system design and installation is a thoroughly evaluated when the system components are commissioned and the adjustive energization survey is undertaken.

Following defined project commissioning and/or test procedures, all components are reviewed, documented and once technical parameters are met, the system is energized and adjusted to achieve maximum efficiency while ensuring tank asset complete cathodic protection.

Having trained and qualified staff is critical in completing this work and Corrosion Service has specialized crews that are NACE trained and certified for completing commissioning reporting, compliance inspections, annual and adjustive maintenance surveys.

All data obtained from site is reviewed and a technical analysis is completed by specialist engineers and information is included in a detailed report for the clients to review and issue with confidence to regulators.

The Corrosion Service Technical Library that Documents our Past and Defines our Future

Corrosion Service has and remains a leader in the corrosion control industry, therefore supporting the various industries in North America and around the World, ensuring asset integrity by providing responsible engineering services.

As part of our continued commitment we would like to welcome you to our electronic Library as the place to view our various technical papers written and presented over the past 69+ years that have supported the corrosion industry advancement.

We converted a prime corner office into a Library at our Head Office and dedicated the room to Sorin Segall because of his commitment to Corrosion Service, the numerous papers presented, the engineering mentoring within Corrosion Service and to our industry.

We would be pleased for you to come and view this comprehensive library that includes various text books, relevant publications, all NACE Materials Performance magazines presented since first publication, technical bulletins and various other related corrosion related print material.

Since our founding in 1950, we have built an extensive portfolio of specialist products for the corrosion prevention industry.

Our materials supply team has access to a full-range of Tank Cathodic Protection and Corrosion Integrity materials manufactured in-house and sourced from partner suppliers.

Our dedicated supply chain team is based in Toronto alongside our material distribution hub, which is capable of delivering materials throughout the world on short notice.