Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5360525 | Applied Surface Science | 2010 | 8 Pages |
Abstract
An AM50 magnesium alloy was plasma electrolytic oxidation treated using a pulsed DC power supply at three different pulse frequencies viz., 10Â Hz, 100Â Hz and 1000Â Hz with a constant pulse ratio for 15Â min in an alkaline phosphate electrolyte. The resultant coatings were characterized by X-ray diffraction, energy dispersive spectroscopy and scanning electron microscopy for their phase composition and microstructural features. The 10Â Hz condition yielded relatively thick and rough coatings, which was attributed to the higher energy input per individual pulse during the PEO processing. The phase composition was also found to be influenced by the processing frequency. Electrochemical impedance spectroscopy studies performed in 0.1Â M NaCl solutions revealed that the coatings produced at 10Â Hz condition had a better corrosion resistance, which was attributed to the higher thickness, more compact microstructural features and a relatively stable phase composition.
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Authors
P. Bala Srinivasan, J. Liang, R.G. Balajeee, C. Blawert, M. Störmer, W. Dietzel,