Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5465056 | Surface and Coatings Technology | 2017 | 40 Pages |
Abstract
Plasma electrolytic oxidation (PEO) on 7075 Al-Zn-Mg-Cu alloy was performed to produce the ceramic coatings in silicate electrolyte at constant voltage. The plasma electron temperature, electron density and atomic ionization degree in plasma zone were evaluated by analyzing the spectral lines of optical emission spectroscopy (OES), and the high spike peaks on plasma temperature profiles were emphatically discussed. The average electron temperature in plasma zone was about 3000 K-15,000 K, and the electron density was about 4.95 Ã 1021 mâ 3-1.65 Ã 1022 mâ 3, meanwhile the atomic ionization degree of Al was less than 10â 3, while the temperature inside the alloy is below 120 °C. It was believed that the high spike peaks on plasma temperature profiles appeared in the later stage of PEO process resulted from the calculation deviation of plasma temperature from weak OES spectral line intensities. The generation of these spike peaks depended on the spark density and illumination intensity rather than the appearance of large discharge sparks, which was different from the previous viewpoint.
Keywords
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Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Xuan Yang, Lin Chen, Yao Qu, Run Liu, Kejian Wei, Wenbin Xue,