| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Effect of the Pulse Duty Cycle on Characteristics of Plasma Electrolytic Oxidation Coatings Formed on AZ31 Magnesium Alloy |
| CHEN Huan1, LV Guo-Hua1, ZHANG Gu-Ling2, PANG Hua1, WANG Xing-Quan3, ZHANG You-Wei1, LEE Heon-Ju4, YANG Si-Ze1,5 |
| 1Institute of Physics, Chinese Academy of Sciences, Beijing 1001902College of Science, Central University for Nationalities, Beijing 1000813College of Science, Changchun University of Science and Technology, Changchun 1300224Faculty of Mechanical and Energy System Engineering, Cheju National University, Cheju 690-756, Korea5Fujian Key Lab of Plasma and Magnetic Resonance, School of Physics and Mechanical and Electrical Engineering, Xiamen University, Xiamen 363105 |
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| Cite this article: |
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CHEN Huan, LV Guo-Hua, ZHANG Gu-Ling et al 2009 Chin. Phys. Lett. 26 096802 |
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Abstract Ceramic coatings are synthesized on AZ31 magnesium alloy in alkaline silicate solution by the method of plasma electrolytic oxidation. The effect of two different duty cycles (10% and 50%) on the structure and corrosive properties of the coatings is investigated. It is found that the coatings are mainly composed of MgO, Mg2SiO4 and MgF2 through XRD analysis. SEM images indicate that coatings formed at 50% duty cycle have a relatively coarse surface with larger pore size and fewer pores, and have a slower growth rate than those formed at 10% duty cycle with the same treatment time. However, the results of potentiodynamic polarization tests demonstrate that coatings formed at 50% duty cycle exhibit better corrosion resistance as a result of more compact microstructure.
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| Keywords:
68.55.-a
81.65.Kn
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Received: 22 April 2009
Published: 28 August 2009
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| PACS: |
68.55.-a
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(Thin film structure and morphology)
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81.65.Kn
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(Corrosion protection)
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