Abstract
Magnesium ions were implanted by plasma immersion into Kapton, Mylar (PET), and polyethylene (PE) films to create a protective MgO layer for protection against atomic oxygen in low earth orbit environment. Exposure to oxygen plasmas showed improvement in oxidation resistance similar to previous results obtained with aluminum implantation. X-Ray photoelectron spectroscopy depth profile analysis showed that MgO layers had similar thicknesses and mixing layers as previous aluminum implantation. A much thinner and shallower layer was deposited on Mylar with metallic Mg together with the oxide, probably due to a lower bias voltage caused by variable plasma response to the applied voltage. Inspecting the surface with scanning electron microscope after oxidation, thermal cycling, and adhesion tests, the presence of cracks and pinholes showed a more severe degradation of the deposited layer when compared to aluminum deposition.
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