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?

Cathodic protection is an electrochemical technique used to prevent corrosion of metal surfaces. By turning the protected structure into the cathode of an electrochemical cell, corrosion is significantly slowed or even stopped. 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)
  The steel components exposed to marine and humid conditions are protected by a combination of sacrificial zinc and aluminium anodes.
• Golden Gate Bridge (USA)
  The underwater anchorages and submerged steel components are protected using sacrificial zinc anodes.
• The Øresund Bridge (Denmark-Sweden)
  Employing sacrificial anodes (commonly zinc or aluminium) on submerged steel parts to prevent corrosion.
• The Channel Tunnel (Eurotunnel, UK/France)
  The tunnel is protected throughout its length using impressed current cathodic protection (ICCP) systems.

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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