The design for corrosion inside a monopile foundation anticipates low, uniform corro sion rates in a closed compartment, but in 2-10 year old foundations sea water and thus oxygen ingress have been detected, increasing corrosion rates and localising attacks. Inspections are therefore necessary to evaluate the current corrosion state, prevailing mechanisms, cause of changed conditions, and whether areas with risk of stress concentration, e.g. at welds, are susceptible to corrosion fatigue. Monitoring campaigns increase our understanding of the conditions under which wind turbine foundations must function in the years to come and document effect of a given change. The vision is that the knowledge gained should be integrated in future de signs, and that simple corrosion monitoring should be installed at the time of con struction.
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