Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/428607
Title: Development and Evaluation of Plasma Electrolytic Oxidation Coatings for Spacecraft Applications
Researcher: Pillai, Anju M
Guide(s): Sampath, S
Keywords: Chemistry
Chemistry Inorganic and Nuclear
Physical Sciences
University: Indian Institute of Science Bangalore
Completed Date: 2021
Abstract: Spacecraft structures are often fabricated out of light weight materials in order to reduce the overall mass, thereby reducing the launch cost and/or increasing the payload capability. Aluminium alloys, especially AA6061, is one of the most commonly used metallic structural materials owing to its high strength to weight ratio. A wide range of surface modification techniques such as painting, powder coating, chemical conversion coating, sol-gel deposition, electrophoretic deposition, physical or chemical vapour deposition, electrochemical deposition etc. are often employed to alter one or more surface properties of the alloy for specific functional applications in the spacecraft. Among them, electrochemical methods such as anodization, electroplating, electroless plating etc. are identified as simple, cost-effective and versatile. Plasma Electrolytic Oxidation (PEO) is one such emerging electrochemical surface modification technology suitable to develop thick ceramic coatings on metals like aluminium, magnesium, titanium etc. The PEO process is a conversion coating process similar to anodizing in which the part (job) to be coated is made as the anode of a suitable electrolytic cell. Unlike anodization, where strong mineral acids are employed as electrolyte, the PEO process utilizes mild alkaline solutions as electrolytes and are hence quite environmentally friendly. The process utilizes high voltage, sufficient enough to reach the breakdown potential of the thin insulating oxide layer initially formed on the metal surface, resulting in the formation of large number of short-lived micro discharges which appear as numerous sparks distributed uniformly throughout the surface. The high temperature and pressure generated inside the discharge channel melt the substrate element as well as the already formed oxide, and the molten material gets ejected out of the channel. The anionic species in the electrolyte enter the discharge channel by electrophoresis and get involved in complex plasma assisted chemical reactions...
Pagination: xx, 191
URI: http://hdl.handle.net/10603/428607
Appears in Departments:Inorganic and Physical Chemistry

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02_prelim pages.pdf2.53 MBAdobe PDFView/Open
03_table of contents.pdf338.63 kBAdobe PDFView/Open
04_abstract.pdf856.86 kBAdobe PDFView/Open
05_chapter 1.pdf971.51 kBAdobe PDFView/Open
06_chapter 2.pdf920.9 kBAdobe PDFView/Open
07_chapter 3.pdf3.3 MBAdobe PDFView/Open
08_chapter 4.pdf1.68 MBAdobe PDFView/Open
09_chapter 5.pdf3.63 MBAdobe PDFView/Open
10_chapter 6.pdf918.86 kBAdobe PDFView/Open
11_annexure.pdf397.24 kBAdobe PDFView/Open
80_recommendation.pdf749.83 kBAdobe PDFView/Open
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