First experiences in the assessment and mitigation of marine corrosion in metallic components for marine renewable energy devices

EUROCORR 2013 (September 2013).

 David Fernández de Rucoba, Raúl Rodríguez Arias, Iñaki Gorrochategui Sánchez


Degradation due to the environment in marine devices and components is one of the main issues facing offshore industries, and is an issue even greater in devices with a high degree of autonomous operation. In this paper, an ongoing research and experimental project approved by the EC-funded network of research centres MARINET is presented. The project CoMaRE -Assessment and mitigation of marine Corrosion in metallic components in Marine Renewable Energy (MRE) devices- is focused in the assessment of the marine corrosion phenomena on metallic components in MRE devices from a practical point and in the evaluation of different candidate Corrosion Protection Techniques for metallic components.

During the first phase of the CoMaRE project the first activity has been the definition of the test plan for the whole project and also the first experiences on field have taken place. The specimens tested against corrosion cover a wide range of components used in these devices as mooring chains, hawsers, steel plates and joints among others.

The first experiences in the offshore field test facilities of the IWES Fraunhofer have started in the North Sea in the Helgoland Island (Germany) and the first results have been obtained. The cumulative environmental loads at this offshore test site differ considerably from the loads on materials in laboratory tests. Materials are subjected to extreme offshore conditions: temperature fluctuations, increased UV radiation, exposure to seawater, biologically induced corrosion and mechanical loads.

In this phase of the CoMaRE Project, mooring chains slides (with and without a thermally sprayed aluminium coating), pieces of hawsers of different diameters, steel plates and polymer composite specimens (with and without carbon nanotubes) are being tested at the offshore test rig in several marine conditions (atmospheric, tidal, splash and submerged).