Corrosion Protection for Marine Power Plants: Advanced Fatigue Strength Analyses

Produktinformationen

Dr.-Ing. Michel Hauer, michel.hauer@igp.fraunhofer.de; M.Sc. CarlChristian Nehls, carl.christian.nehls@igp.fraunhofer.de; Dr. Oliver Bätz, oliver.braetz@igp.fraunhofer.de; M.Sc. Pratidhwani Biswal, pratidhwani.biswal@igp.fraunhofer.de; Dr. Andreas Gericke, andreas.gericke@igp.fraunhofer.de; Prof. Dr. Knuth Henkel, knuth.henkel@uni-rostock.de;

Although having high a potential, marine power plants are currently still rarely used. Tidal, current and wave power plants are coming more into focus due to long European coastlines and high degree of planning reliability. One of the current cost drivers is the scaling and durability of the widely utilized ductile cast iron materials.  Due to direct contact with seawater, the cast components are generally sealed with organic coatings and in some cases protected with sacrificial anodes. Since these methods, however, are not durable over a long time, free corrosion of the components occurs, lowering fatigue strength significantly. This leads to huge corrosion additions in the operational strength assessment in the design phase. Hence, in a recent project, thermal sprayed coatings based on steel, Al, Zn, pseudo alloys thereof and Cu were applied to cast materials subject to fatigue stress to prevent corrosion and conserve long-term fatigue strength. It became apparent, that cast iron coated by Al99 showed a higher fatigue strength, while coating properties were superior. Details on fracture surfaces were captured and, moreover, examinations in terms of fatigue were carried out on coated specimens with local defects.

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Erscheinungsdatum

März 2026

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