Effects of Matrix Silicon Content on the Plasma Electrolytic Oxidation of Al-Si Alloys Using Different Power Modes

Kang Li; Guoge Zhang; Aihua Yi; Wen Zhu; Zhongmiao Liao; Ken Chen; Wenfang Li; Zhenyuan Luo

doi:10.3390/cryst12010123

Crystals (Jan 2022)

Effects of Matrix Silicon Content on the Plasma Electrolytic Oxidation of Al-Si Alloys Using Different Power Modes

Kang Li,
Guoge Zhang,
Aihua Yi,
Wen Zhu,
Zhongmiao Liao,
Ken Chen,
Wenfang Li,
Zhenyuan Luo

Affiliations

Kang Li: College of Materials Science and Technology, Dongguan University of Technology, Dongguan 523820, China
Guoge Zhang: College of Materials Science and Technology, South China University of Technology, Guangzhou 510641, China
Aihua Yi: College of Materials Science and Technology, Dongguan University of Technology, Dongguan 523820, China
Wen Zhu: College of Materials Science and Technology, Dongguan University of Technology, Dongguan 523820, China
Zhongmiao Liao: College of Materials Science and Technology, Dongguan University of Technology, Dongguan 523820, China
Ken Chen: College of Materials Science and Technology, Dongguan University of Technology, Dongguan 523820, China
Wenfang Li: College of Materials Science and Technology, Dongguan University of Technology, Dongguan 523820, China
Zhenyuan Luo: College of Materials Science and Technology, Dongguan University of Technology, Dongguan 523820, China

DOI: https://doi.org/10.3390/cryst12010123
Journal volume & issue: Vol. 12, no. 1
p. 123

Abstract

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The plasma electrolytic oxidation (PEO) of pure Al and Al alloys containing 4, 9, 12, or 15 wt.% Si were investigated under pulsed bipolar current and pulsed bipolar voltage modes, respectively. It was determined that the discharge sparks preferentially occurred on the SiO2 relative to the Al2O3 during the initial stage of PEO processing regardless of the power mode. Following 30 min of PEO treatment under the two modes, the thicknesses of the layers decreased, whereas their specific energy consumption increased with increasing Si content in the matrix. The presence of primary Si in the alloy with 15 wt.% Si had a significantly negative effect on the PEO process in the pulsed bipolar current mode: The layer thickness decreased by 45%, and its specific energy consumption increased by 52%, compared with those on pure Al. However, in the pulsed bipolar voltage mode, the layer thickness on the evaluated samples only decreased slightly, and it became much more similar after treatment.

Published in Crystals

ISSN: 2073-4352 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Crystallography
Website: http://www.mdpi.com/journal/crystals/

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