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Microarc oxidation coating formed on SiCw/AZ91 magnesium matrix composite and its corrosion resistance |
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| Affiliation: | 1. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. MagIC – Magnesium Innovation Centre, Institute of Materials Research, Helmholtz Zentrum Geesthacht, Max-Plank-Str. 1, 21502 Geesthacht, Germany;3. Faculty of Engineering, University of Kiel, Kaiserstrasse 2, 24143 Kiel, Germany;1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;2. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, 21502 Geesthacht, Germany |
| Abstract: | A ceramic coating was synthesized on the surface of SiCw/AZ91 magnesium matrix composite by means of microarc oxidation (MAO) technique. Scanning electron microscope (SEM) was employed to characterize the surface morphology and cross-section microstructure of the coating. The phase structure and the chemical composition of the ceramic coating were analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of the coating was evaluated by immersion test and electrochemical method. The results showed that the corrosion rate of the coated SiCw/AZ91 composite was decreased greatly compared with that of the bare composite because of the protective microarc oxidation coating. |
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