INFLUENCE OF VOLTAGE ON ANODE GAS COMPOSITIONS DURING PLASMA ELECTROLYTIC OXIDATION OF 60 VOL.% SiCp/2009 ALUMINUM MATRIX COMPOSITE

Yizhao Liao, Xingping Wang, Chi Xu, Kejian Wei, Chuanli Gao, Jiancheng Du, Xiaoyue Jin, Fubin Jiang, Wenbin Xue and Yongzhong Zhang
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Yizhao Liao: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, P. R. China
Xingping Wang: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, P. R. China
Chi Xu: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, P. R. China
Kejian Wei: ��Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng 475004, P. R. China
Chuanli Gao: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, P. R. China
Jiancheng Du: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, P. R. China
Xiaoyue Jin: ��Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, P. R. China
Fubin Jiang: �College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China
Wenbin Xue: Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, P. R. China†Institute of Radiation Technology, Beijing Academy of Science and Technology, Beijing 100875, P. R. China
Yongzhong Zhang: �General Research Institute for Nonferrous Metals, Beijing 100088, P. R. China

Surface Review and Letters (SRL), 2022, vol. 29, issue 12, 1-16

Abstract: Plasma electrolytic oxidation (PEO) was performed on 60 vol.% SiCp/2009 aluminum matrix composite under different voltages in silicate solution and NaF solution, respectively. Anode gas evolutions under different conditions during the PEO process were evaluated by the gas chromatograph, optical emission spectroscopy, scanning electron microscope, X-ray diffraction and inductively coupled plasma atomic emission spectroscopy. The anode gas released at different voltages in both solutions contained H2, O2 and trace CO. The H2 concentration increased with the increase of voltage in the silicate solution, and then it was kept at 75–80 vol.% in the range from +480 V/–0 V to +520 V/–0 V, which was related to the appearance of strong discharge sparks. The H2 concentration of the anode gas in NaF solution was much lower than that in the silicate solution due to the weak discharge. The excessive H2 was caused by nonfaradaic reactions in the plasma discharge region such as thermal decomposition of water. Meanwhile, the O2 in anode gas mainly came from thermal decomposition of water in plasma discharge region and traditional electrochemical reactions in nondischarge region. In addition, SiC reinforcement particles were oxidized in plasma discharge channels with the temperature up to 5000 K, accompanied by the release of trace CO. Furthermore, CO2 was hardly detected due to the effect of H2 reduction in the discharge channels.

Keywords: Plasma electrolytic oxidation; aluminum matrix composite; SiC reinforcement particles; gas evolution; gas chromatograph (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X23500014

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