| Original Articles |
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Microstructure and Corrosion Performance of Oxide Coatings on Aluminium by Plasma Electrolytic Oxidation in Silicate and Phosphate Electrolyte |
| LV Guo-Hua;GU Wei-Chao;CHEN Huan;LI Li;NIU Er-Wu;YANG Si-Ze |
| Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,
Beijing 100080 |
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| Cite this article: |
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LV Guo-Hua, GU Wei-Chao, CHEN Huan et al 2006 Chin. Phys. Lett. 23 3331-3333 |
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Abstract Ceramic coatings are fabricated on pure aluminium by plasma electrolytic oxidation (PEO) in three kinds of electrolyte systems [E1: 0.05M NaOH+0.033M Na₂SiO₃, E2: 0.025M NaOH+0.008M (NaPO₃)6; and E3: 0.025M NaOH+0.066M Na₂SiO₃+0.008M (NaPO₃)6]. The voltage--time responses show that the PEO process of E2 has the highest discharging voltage, which results in the biggest pores and heaviest cracks on the surfaces. X-ray diffraction results show that coatings produced in E1 and E3 are mainly composed of γ-Al₂O₃ and mullite, while coatings produced in E2 are mainly composed of α-Al₂O₃. After PEO treatment the corrosion resistance of aluminium is improved significantly and the coatings produced in E3 perform the best corrosion resistance.
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| Keywords:
68.55.-a
81.65.Kn
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Published: 01 December 2006
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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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