Influence of surface etching pretreatment on PEO process of eutectic Al-Si alloy

Kang Li; Wenfang Li; Guoge Zhang; Min Wang; Peng Tang

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Influence of surface etching pretreatment on PEO process of eutectic Al-Si alloy

材料与产品工程 | Updated：2026-01-06

- Influence of surface etching pretreatment on PEO process of eutectic Al-Si alloy
- Chinese Journal of Chemical Engineering Vol. 23, Issue 9, Pages: 1572-1578(2015)
- Affiliations：
  
  1. School of Materials Science and Engineering, South China University of Technology,Guangzhou,China,510641
  2. College of Mechanical Engineering, Guangdong Polytechnic Normal University,Guangzhou,China,510635
  3. School of Materials Science and Engineering, Guangxi University,Nanning,China,530004
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2015
- Accepted：
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Kang Li, Wenfang Li, Guoge Zhang, Min Wang, Peng Tang. Influence of surface etching pretreatment on PEO process of eutectic Al-Si alloy[J]. , 2015, 23(9): 1572-1578.
DOI：

Kang Li, Wenfang Li, Guoge Zhang, Min Wang, Peng Tang. Influence of surface etching pretreatment on PEO process of eutectic Al-Si alloy[J]. , 2015, 23(9): 1572-1578. DOI：

摘要

Abstract

To solve the problems generally encountered during the plasma electrolytic oxidation (PEO) of Al alloys with high Si content

a pretreatment of chemical etching was applied before the process. The influence of such pretreatment was studied by SEM

EDS and XRD. The pretreatment presents a significant effect on positive voltage at the beginning stage of PEO

leading to higher voltage over thewhole process. The difference between the positive voltages of non-etched and etched specimens decreases graduallywith the increase of processing time. The pretreatment exhibitsmuch less influence on the negative voltage. For the sample with surface pretreatment

the average growth rate of PEO coating is increased from 0.50 to 0.84 μm·min

-1

and the energy consumption is decreased from 6.30 to 4.36 kW·h·μm

-1

·m

-2

. At the same time

both mullite and amorphous SiO

contents are decreased in the coating.

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