... Un-ter den Strahlverfahren selbst konnte keine eindeutige Tendenz festgestellt werden teilweise lieferten mit Hoch-druckwasser vorbereitete Oberflächen bessere Werte, teilweise waren mit Andreas Momber Sven Koller Zur... more
... Un-ter den Strahlverfahren selbst konnte keine eindeutige Tendenz festgestellt werden teilweise lieferten mit Hoch-druckwasser vorbereitete Oberflächen bessere Werte, teilweise waren mit Andreas Momber Sven Koller Zur Korrosionsschutzwirkung von ...
Research Interests: Stahlbau()
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... Un-ter den Strahlverfahren selbst konnte keine eindeutige Tendenz festgestellt werden teilweise lieferten mit Hoch-druckwasser vorbereitete Oberflächen bessere Werte, teilweise waren mit Andreas Momber Sven Koller Zur... more
... Un-ter den Strahlverfahren selbst konnte keine eindeutige Tendenz festgestellt werden teilweise lieferten mit Hoch-druckwasser vorbereitete Oberflächen bessere Werte, teilweise waren mit Andreas Momber Sven Koller Zur Korrosionsschutzwirkung von ...
Research Interests: Stahlbau()
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Research Interests: Geometry()
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Research Interests: Erosion()
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Zusammenfassung Es wurde der Einsatz von Wasserstrahlen mit Geschwindigkeiten bis vS=200 m/s zum Abtrag organischer Beschichtungen von textilen Vliesgeweben untersucht. Mittels Hochgeschwindigkeitsvideoaufnahmen wurde der Werkstoffabtrag... more
Zusammenfassung Es wurde der Einsatz von Wasserstrahlen mit Geschwindigkeiten bis vS=200 m/s zum Abtrag organischer Beschichtungen von textilen Vliesgeweben untersucht. Mittels Hochgeschwindigkeitsvideoaufnahmen wurde der Werkstoffabtrag dokumentiert, und es wurde ein phänomenologisches Abtragsmodell vorgeschlagen. Der Einfluss wichtiger Prozesskennwerte (Strahlgeschwindigkeit, Arbeitsabstand, Düsenkonfiguration, Überfahrschritte) wurde experimentell untersucht. Die Ergebnisse zeigten, dass Wasserstrahlen ein selektives und effektives Trennen von textilen Belägen ermöglichen.
Six corrosion protection systems for offshore wind power constructions have been subjected to offshore conditions on a test site in the North Sea in three different exposure zones, namely splash zone, intermediate zone, and underwater... more
Six corrosion protection systems for offshore wind power constructions have been subjected to offshore conditions on a test site in the North Sea in three different exposure zones, namely splash zone, intermediate zone, and underwater zone. The systems included single- and multiple-layered organic coatings, metal-spray coatings, and duplex coatings. Special testing specimens were designed and manufactured and exposed to an offshore environment for three years in order to characterize particular constructive details for different corrosivity zones. The following target parameters were investigated: intensity of fouling, anti-corrosive effect, coating adhesion, coating integrity, flange corrosion, coating performance over welds, and condition of screw connections. Fouling was an issue in the underwater zone and in the intermediate zone, but it did not affect the coating corrosion protection capacity. It was found that duplex systems, consisting of Zn/Al spray metallization, intermedia...
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In order to figure out the possible benefits for wind power applications, aero-dynamic experiments were carried out. A model of a profile DU-W-300, approx. 150 cm in length, was aerodynamically characterized in a wind-tunnel. The... more
In order to figure out the possible benefits for wind power applications, aero-dynamic experiments were carried out. A model of a profile DU-W-300, approx. 150 cm in length, was aerodynamically characterized in a wind-tunnel. The measurements were carried out at 50 m/s and 75 m/s wind speed and for different angles of attack. The measurements were performed in two steps: First, using the non-coated model, and subsequently using the same model with a riblet-coating. In the results of the experiments, an improvement of the glide ratio of the profile by approx. 30% at the relevant angles of attack could be shown.
Organic coating systems have been investigated according to their performance under low-temperature offshore conditions. Three performance groups were considered: corrosion protection performance, performance under mechanical loads, and... more
Organic coating systems have been investigated according to their performance under low-temperature offshore conditions. Three performance groups were considered: corrosion protection performance, performance under mechanical loads, and de-icing performance. The investigations involved the following tests: accelerated corrosion protection/ageing testing, anti-icing tests, tests for coating adhesion, impact resistance tests, hardness abrasion tests, and wettability tests. The test conditions were adapted to Arctic offshore conditions, which mainly covered low temperatures down to -60°C, dry-wet cycles, and UV radiation. A testing facility for rime ice accretion has been developed. Standard offshore tests for corrosion protection assessment were partly modified. The coating systems investigated were organic coating systems which differed in generic coating material, number of layers, dry film thickness and application method.
1. Theorie der Strömungsoptimierung durch strukturierte Lackschichten 2. Stand der Lackentwicklung und Applikationstechnik 3. Stand der Technik bei Flugzeug- und Schiffsanwendungen 4. Perspektive für die Windenergie
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ABSTRACT Im Rahmen von Auslagerungs- und Laborprüfungen wurde die Korrosionsschutzwirkung verschiedener, für den Schutz von Offshore-Windenergietürmen geeigneter Systeme untersucht. Zu den untersuchten Systemen gehörten Duplexsysteme mit... more
ABSTRACT Im Rahmen von Auslagerungs- und Laborprüfungen wurde die Korrosionsschutzwirkung verschiedener, für den Schutz von Offshore-Windenergietürmen geeigneter Systeme untersucht. Zu den untersuchten Systemen gehörten Duplexsysteme mit Zn/Al-Metallisierung, mehrschichtige organische Systeme, ein einschichtiges organisches System, eine Zn/Mg-Metallisierung sowie unbeschichtete Bereiche mit kathodischem Korrosionsschutz. Alle Systeme wurden an speziell gefertigten Auslagerungsprobekörpern sowie an Laborprobekörpern geprüft. Die im Labormaßstab durchgeführten Prüfungen umfassten Tauchversuche, Alterungsversuche, Versuche zur kathodischen Verträglichkeit und Messungen mittels elektrochemischer Impedanzspektroskopie. Im Teil 1 des Beitrages, veröffentlicht im Heft 4/2009, wurden Konzeption und Durchführung der Prüfungen sowie die verwendeten Probekörper und Korrosionsschutzsysteme detailliert beschrieben. Über die Ergebnisse der Prüfungen wird im Teil 2 berichtet.Assessment of corrosion protection systems for offshore wind energy towers – part 2: Results and conclusions.Based on field and on laboratory tests, the corrosion protective performance of different corrosion protection systems for offshore wind energy towers was investigated. The systems under investigation included duplex systems with Zn/Al metallization, multi-layered organic systems, a single-layer thick organic system, Zn/Mg metallization and cathodic protection of uncoated sections. Special field specimens and laboratory specimens were utilized in order to investigate the systems. Laboratory tests included immersion tests, ageing tests, test on cathodic compatibility and electro-chemical impedance spectroscopy. Part 1 of the paper (Stahlbau, No. 4/2009) covererd the general experimental design and details of the experimental procedures, whereas Part 2 deals with the results of the test programme.
Research Interests: Stahlbau()
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The presentation reports about a nationally funded 3-year R&D project on the effects of edge geometry and coating type on the corrosion protection performance of organic coatings on edges with particular attention to ballast water tank... more
The presentation reports about a nationally funded 3-year R&D project on the effects of edge geometry and coating type on the corrosion protection performance of organic coatings on edges with particular attention to ballast water tank applications. Core of the presentation is the description of the testing scenarios, the introduction of three assessment methods, and the discussion of the results. Testing methods included the long-term testing of samples in a specially designed IMO chamber, the utilisation of electric impedance spectroscopy and DFT measurements on polished cross sections of coated edges.
Electrochemical impedance spectroscopy measurements helped to identify the initiation of failure at the edge, which was mainly due to the sudden formation of localized defects. The tests performed in a wave chamber were useful for the... more
Electrochemical impedance spectroscopy measurements helped to identify the initiation of failure at the edge, which was mainly due to the sudden formation of localized defects. The tests performed in a wave chamber were useful for the further observation of paint deterioration and corrosion. Results were statistically interpreted, and it was found that edge radius had a negligible effect on dry film thickness, whereas rounding tool and paint system had notable effects. The latter two parameters had also significant effects on paint deterioration and corrosion at edges. Paint application is another important factor.
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Because of the very special locations and the aggressiveness of the corrosive environment, offshore wind energy towers (OWET) require special corrosion protection. Damages that frequently appeared in the past after rather short operation... more
Because of the very special locations and the aggressiveness of the corrosive environment, offshore wind energy towers (OWET) require special corrosion protection. Damages that frequently appeared in the past after rather short operation times underline the importance of a carefully designed corrosion protection. The authors report about results of a nationally funded project on the performance of different corrosion protection