Assessment and mitigation of marine corrosion in metallic components in Marine Renewable Energy devices: first experiences from offshore field tests in the North Sea

Thetis EMR 2013 (April 2013).

 

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

 Abstract:

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 poster, 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. The specimens that could be tested against corrosion may cover a wide range of components used in MRE devices as mooring chains, hawsers, steel plates and joints among others.

 During the first phase of the CoMaRE project the main activity has been the definition of the test plan for the complete project. The first experiences on field have also taken place. 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).

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.