Monopile structures represent the majority of offshore wind foundation structures. In the early days, monopiles were designed with watertight platforms to prevent oxygen ingress that may lead to internal corrosion. In practice, some water exchange occurs due to failure of the watertight system. Today monopile foundations with replenishment holes are more common.

This paper discusses the application of impressed current cathodic protection (ICCP) systems for the corrosion protection of internal surfaces of the monopile. The CP design calculations were verified by computational modeling with time dependent simulations for the entire design life. The cathodic protection level, gas production and growth of calcareous deposit was computed for a watertight and open foundation. Long term field monitoring data of the CP system is used to validate the design rules and predictions by the computational models.

Subject
Electric current, Steel structures, Water, Offshore structures, Impressed current cathodic protection, Modeling, Structures, Seawater, Current densities, Wind, Polarization, Protection potential, Electrode potential
Keywords:
Corrosion control, impressed current cathodic protection, marine environment, computational modeling
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2023
Association for Materials Protection and Performance (AMPP)
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