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Article

Tuning the Surface Characteristic of Al-Si Alloys and Its Impacts on the Formation of Micro Arc Oxidation Layers

by
Kang Li
1,
Wenfang Li
1,*,
Aihua Yi
1,
Wen Zhu
1,
Zhongmiao Liao
1,
Ken Chen
1 and
Weimin Li
2,*
1
School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
2
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
*
Authors to whom correspondence should be addressed.
Coatings 2021, 11(4), 453; https://doi.org/10.3390/coatings11040453
Submission received: 7 March 2021 / Revised: 5 April 2021 / Accepted: 12 April 2021 / Published: 14 April 2021
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Abstract

Aluminum Silicon (Al-Si) alloys are the most important among cast alloys and have widespread application. The β-Si phase is detrimental to the growth of micro arc oxidation (MAO) layers on Al-Si alloys. In this paper, the β-Si in the skin layer of different Al-Si alloys was removed by an acid etching pretreatment. Then, the impacts of different etching condition on their MAO process were investigated. Results show that, as etching time was prolonged, the Si content on the surface of Al-12 Si was decreased greatly (less than 0.5 wt.%), and the average size of pores left on the sample surface was increased gradually. This then led to the occurrence of some bigger and more drastic discharge sparks at the earlier oxidation stage. The corresponding layers had a higher ratio of Al2O3 and better corrosion resistance after 30 min of oxidation. Moreover, a 60 s etching pretreatment benefitted and boosted the growth rate and energy efficiency of layers on the Al-9 Si, Al-12 Si and Al-15 Si alloys. Such pretreatment was believed to be applicable to restrain the negative effects of Si on the MAO of different Al-Si alloys.
Keywords: micro arc oxidation; Al-Si alloys; etching condition; growth rate; energy efficiency micro arc oxidation; Al-Si alloys; etching condition; growth rate; energy efficiency

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MDPI and ACS Style

Li, K.; Li, W.; Yi, A.; Zhu, W.; Liao, Z.; Chen, K.; Li, W. Tuning the Surface Characteristic of Al-Si Alloys and Its Impacts on the Formation of Micro Arc Oxidation Layers. Coatings 2021, 11, 453. https://doi.org/10.3390/coatings11040453

AMA Style

Li K, Li W, Yi A, Zhu W, Liao Z, Chen K, Li W. Tuning the Surface Characteristic of Al-Si Alloys and Its Impacts on the Formation of Micro Arc Oxidation Layers. Coatings. 2021; 11(4):453. https://doi.org/10.3390/coatings11040453

Chicago/Turabian Style

Li, Kang, Wenfang Li, Aihua Yi, Wen Zhu, Zhongmiao Liao, Ken Chen, and Weimin Li. 2021. "Tuning the Surface Characteristic of Al-Si Alloys and Its Impacts on the Formation of Micro Arc Oxidation Layers" Coatings 11, no. 4: 453. https://doi.org/10.3390/coatings11040453

APA Style

Li, K., Li, W., Yi, A., Zhu, W., Liao, Z., Chen, K., & Li, W. (2021). Tuning the Surface Characteristic of Al-Si Alloys and Its Impacts on the Formation of Micro Arc Oxidation Layers. Coatings, 11(4), 453. https://doi.org/10.3390/coatings11040453

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