This paper presents the results of a case study regarding corrosion data from 14 No. internal wind turbine structures within the flooded sections. The study analyzed 342 No. test coupons used to determine the corrosion rates within different locations within the monopiles under the air tight deck over a period of several years and timescales. Coupons were inserted below the air tight deck (also referred to the gas tight floor) at various elevations from top in the atmospheric region to the seabed. The coupons were carefully removed and treated to avoid further corrosion occurring, cleaned and weighed. Corrosion rates were established from this and further analysis of pitting rates were carried out. The results were compared to published literature and standards.

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