Cathodic Protection Performance of ICCP System applied to Floating Offshore Reinforced Concrete Structure

Reinforced concrete structures in marine environments frequently experience premature deterioration due to corrosion, particularly of the steel reinforcement, which is a leading cause of degradation in these structures, including bridges and marine airports. In recent years, developed countries have increasingly turned to offshore spaces—such as floating wind farms, floating solar power plants, and floating waste treatment facilities—for infrastructure development, driven by a shortage of available urban land. This trend is also observable in our country, where, despite being surrounded by the sea on three sides, usable land in urban centers is extremely limited. To mitigate corrosion in reinforced concrete structures, various cathodic protection methods are employed, including sacrificial anode cathodic protection (SACP) and impressed current cathodic protection (ICCP). Among these, ICCP is the preferred method due to the high electrical resistivity of concrete. In this study, we applied an ICCP system powered by self-generated energy sources—such as wind power, solar power, and ocean thermal energy—to floating reinforced concrete offshore structures. The performance of the ICCP system was assessed by measuring the cathodic protection current, cathodic protection potential, and depolarization potential.