Cathodic Protection Services: Types, Installation & Uses

Author : EXARO Technologies | Published On : 04 Nov 2026

Steel infrastructure supports essential water, energy, transport and industrial operations. Cathodic protection systems prevent corrosion by making the structure itself the cathode within an electrochemical process. Proper cathodic protection services allow increasing lifespan, enhancing reliability and controlling maintenance. The right systems protect steel structures from corrosive influences in pipelines, tanks, reservoirs, and bridges.

Designing the system for the asset is critical for ensuring the reliable operation of the structure during its entire service life, especially in cases when inspections and maintenance are problematic.

Cathodic Protection: What Is It?

The process of corrosion is an electrochemical reaction between the metal and its environment. Cathodic protection prevents the corrosion process by conducting the corrosion reaction to the anode. The anode will corrode first or will supply protective current to steel structures. Experienced cathodic protection companies consider site conditions before designing the system.

Soil resistivity, water chemistry, structure geometry, and expected service life may affect the design and performance of the system.

Types of Cathodic Protection

The two most common cathodic protection systems include the galvanic (sacrificial) protection and impressed current protection.

1. Galvanic or Sacrificial Anode Systems

In this system, the structure is connected to a relatively active metal like zinc, magnesium or aluminum. The more active material is known as an anode that slowly corrodes to protect the steel from corrosion and naturally provides a protective current. In the absence of any external power supply, this system is suitable for protecting small objects and where current requirements are low.

2. Impressed Current System

In an impressed current cathodic protection (ICCP) system, the power supply, control unit, and the anode are connected to a direct current power supply to provide current to the object being protected. Monitoring checks performance across changing operating environments.

How Installation Is Planned and Carried Out

First, an engineering analysis will be conducted. The project team will analyze drawings, materials, site conditions, coating, and exposure to soil or water. Engineers can also assess the electrical continuity and corrosion control measures. A typical installation involves:

• Designing the system: Assess protection needs, select the system and calculate anode locations and current requirements.
• Site preparation: Secure access, assess neighboring utilities and prepare installation sites.
• Installation of components: Install anodes, cables, and reference electrodes, as well as power and control equipment for impressed current systems.
• Testing and commissioning: Assess electrical readings and connections and tune the system according to the designed specifications.
• Monitoring and maintenance: Perform monitoring and measurements for performance analysis and component replacement.

Common Applications and Practical Benefits

Cathodic protection service can be used for protecting steel structures exposed to a corrosive environment. Examples of such applications are underground water pipelines, gas pipelines, water storage tanks, bridges, parking structures, and marine structures.

An appropriately designed cathodic protection system can help reduce the corrosion rate, extend the life of the structure, improve its reliability and facilitate planning maintenance work. The appropriate response would be based on the size of the building, the electrical characteristics, environmental considerations, and access to the building.

Conclusion

The process of choosing the correct system begins with the assessment of the asset and vulnerability. The professional cathodic protection services encompass all the services of engineering, installation, commissioning, and monitoring of the steel structure to protect it. EXARO Technologies Corporation offers both galvanic and impressed current systems and turnkey solutions via its corrosion engineering partner.

Get in touch with EXARO to get more information about your project and to receive a project quote for your assets.

FAQs

1. What is cathodic protection?

It is a corrosion-control technique that protects metal structures by making them act as cathodes in an electrochemical process.

2. What are the main types of cathodic protection?

The two main types are galvanic (sacrificial anode) and impressed current systems.

3. Where is cathodic protection commonly used?

This technique is used in protecting pipelines, storage tanks, bridges, marine structures and underground steel installations.

4. How long does cathodic protection last?

Its lifespan depends on system design, environmental conditions, anode consumption and maintenance.

5. Why is professional installation important?

Expert installation ensures correct system selection, reliable performance and effective corrosion control.