Cathodic protection

Cathodic protection serves to protect metal components against corrosion. We use anodes to alter the potential of the metal requiring cathodic protection.

Anodes can be of two types :

  • – Sacrificial (or reactive) anodes
  • – Impressed current anodes

The anodes may have different forms and the range of materials used to create the cathodic protection varies greatly. In the majority, zinc, magnesium and aluminium alloys are used.

The quantity and type of anodes to use to ensure efficient cathodic protection is determined using several factors :

  • – The surface material exposed to seawater
  • – The nature of the material (coating, roughness etc.)
  • – The required interval for anode renewal
  • – Seawater currents, temperatures and quality

Inspection :

Our dive teams are fully qualified in Non-Destructive Testing, enabling us to conduct inspections of the state of immersed metal structures. Then we can proposed a cathodic protection solution suited to the specific issues of the site in question.

We also design and manufacture specific tools to ensure fast and efficient measurements. Reliable, accurate data is collected and used to build a precise diagnostic and suitable dimensioning of the cathodic protection solution required.

Field of application :

  • – Pontoons
  • – Piles
  • – Bridge and viaduct piles
  • – Quays
  • – Sheet piles
  • – All rebar concrete structures immersed in seawater
  • – All metal structures immersed in seawater

Applicable standards :

NF EN​ ​12473: General principles of cathodic protection in seawater

NF​ ​EN​ ​12495​: Cathodic protection for fixed steel offshore structures

NF EN 12954: Cathodic protection of buried or immersed metallic structures. General principles and application for pipelines

NF​ ​EN​ ​13173: Cathodic protection for steel offshore floating structures

NF​ ​EN​ ​13174​: ​Cathodic protection for harbour installations

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