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7363 |
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Thursday, May 05, 2022, Hall D 9:00 AM Aviation Industry II |
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The influence of coating composition in the corrosion resistance of magnesium alloys |
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Manuel Reif* / Technische Universität Dresden, Germany Oliver Kunze / Technische Universität Dresden, Institute for Material Science, Germany Tino Mrotzek/ Technische Universität Dresden, Institute for Lightweight Engineering and Polymer Technology, Germany Rebecca Bräuer/ Technische Universität Dresden, Institute for Lightweight Engineering and Polymer Technology, Germany Christoph Leyens/ Technische Universität Dresden, Institute for Material Science, Germany Maik Gude/ Technische Universität Dresden, Institute for Lightweight Engineering and Polymer Technology, Germany Thomas Behnisch/ Technische Universität Dresden, Institute for Lightweight Engineering and Polymer Technology, Germany |
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De-carbonization and increasing requirements regarding fuel efficiency especially in the aerospace sector call for an increased effort in terms of lightweight construction. Speaking of its lightweight potential, magnesium alloys are a promising candidate for an application in aerospace, but the hydrophilic properties as well as the high tendency to corrosion represent a major drawback for the materials’ usability. Thermally sprayed corrosion resistant coatings were used to improve the material’s corrosion resistance. Within a publicly funded project, two different magnesium alloys were used for the corrosion tests: A standard magnesium alloy (AZ91, as reference-material) as well as a so called ECO-Magnesium alloy (Environmentally conscious alloy). The different materials then were coated with Atmospheric plasma spray and high-velocity oxy-fuel spray and different coating materials (metals and oxide ceramics) in order to improve the materials’ corrosion resistance. To test the corrosion resistance, standardized test procedures, for example salt spray test were used. An important part of the project was to investigate the influence factors for the corrosion as well as the influence factors for a sufficient coating and the coating’s morphology. The examination was supported by cross-section-images, scanning electron microscope (SEM) - recordings as well as energy-dispersive X-ray spectroscopy (EDX). The presented work lays the foundation for a use of flame resistant eco-magnesium-alloys in aerospace application both as bulk material or in combination with a carbon fibre reinforcement. |