Description

There are several ways to prevent corrosion on ships. Basically we need to stop the electro chemical reaction, and this is most commonly done by:
Painting
Sacrificial anodes
Impressed current cathodic protection (ICCP)

Impressed current passes through the surrounding sea water to protect the submerged areas of the wind turbines.

Functionality

Current from the DC power source (control unit) is flowing from the anodes, through the seawater to the submerged area of the wind turbine providing corrosion protection. The level of protection is controlled by a certain value of potential measured by the reference electrodes.

The  current requirement is decided by the area of the submerged structure and coating system applied. Number of anodes and reference electrodes depends on the size and geometry of the submerged structure.

The systems is automatically adjusted for performance at various conditions.

Advantages

  • Longer operational life time than sacrificial anodes.
  • Unlimited protection capacity (accepts higher coating breakdown than sacrificial anodes).
  • Continously monitoring and automatic adjustment of the protection level.

System components

  • Control unit: Power supply providing protective DC current to the anodes and automatically regulates the level of protection.
  • Permanent anodes. Surface mounted anodes through which DC current flows out in the seawater and into the submerged part of the wind turbine.
  • Reference electrodes: Surface mounted electrodes that continually monitor the level of protection (potential) of the steel.