In 1824, renowned British chemist and inventor Sir Humphry Davy laid the groundwork for a revolutionary method to combat corrosion. His pioneering research introduced the concept of cathodic protection – a technique that has since become critical in preserving metal structures exposed to harsh environments. Now, 200 years on, cathodic protection remains at the forefront of corrosion control, protecting vital infrastructure across the globe.

What is Cathodic Protection?

Engineers use cathodic protection as an electrochemical technique to prevent corrosion on metal surfaces. By converting the protected structure into the cathode of an electrochemical cell, they can significantly slow or even stop corrosion. This is typically achieved through sacrificial anodes or impressed current systems.

Where is Cathodic Protection Used?

From bridges and pipelines to ships and offshore wind farms, cathodic protection plays a key role in extending the life of structures. Notable examples include:

• Statue of Liberty (USA)
  Zinc sacrificial anodes were installed to protect the iron armature from corrosion.
• Sydney Harbour Bridge (Australia)
  Engineers protect steel components exposed to marine and humid conditions using a combination of sacrificial zinc and aluminium anodes.
• Golden Gate Bridge (USA)
  Engineers protect the underwater anchorages and submerged steel components using sacrificial zinc anodes.
• The Øresund Bridge (Denmark-Sweden)
  Employing sacrificial anodes (commonly zinc or aluminium) on submerged steel parts to prevent corrosion.

These applications show just how essential this technology is in modern infrastructure.

Listen: Saving Structures with Cathodic Protection

To mark this 200-year milestone, the team at Mott MacDonald shared their expertise in a brilliant new episode of the Engineering Matters podcast. It’s well worth a listen for anyone in engineering, infrastructure, or materials science.

Trusted Cathodic Protection Solutions

At Metec, we’re proud to be part of this engineering legacy, providing high-quality anodes and cathodic protection systems that support industries from offshore energy to civil engineering.

Looking for trusted cathodic protection solutions?
Get in touch with our team to discuss your project requirements and see how Metec can help protect your assets for the next generation.

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