D6.1: Comprehensive overview of the project (State of the Art) – FULL PAPER

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D6.1: Comprehensive overview of the project (State of the Art) - FULL PAPER

In this document, HELIX partners have detailed the need for improvements in the field of fasteners and bolts for offshore applications, specifically for offshore wind turbines. First of all, the state of the art on fasteners for offshore applications, steels for fasteners for offshore and corrosion protection has been settled. Accordingly, different strategies have been proposed and will be developed and tested in the HELIX project. On one hand, HELIX will develop, test and provide fasteners able to withstand high applied stresses under harsh environmental conditions typical of large offshore wind turbines. This will be achieved by developing and optimising novel high strength steel grades in qualities 10.9 and 12.9 and new protecting zinc-flake based coatings. On the other hand, HELIX will contribute to unravel how atmospheric and immersed conditions, material composition and microstructure, surface treatment and previous corrosion affect hydrogen embrittlement of high strength steels. HELIX will use advanced characterization techniques as well as traditional techniques to advance in the knowledge of hydrogen absorption in high strength steels under cathodic protection and in atmospheric conditions. This knowledge will not only allow tailoring the steel and coating microstructure to achieve both excellent corrosion protection ability and low risk of hydrogen embrittlement but also influence on policy and practice in the offshore wind sector.