Influence of Complex SiF62- Ions on the PEO Coatings Formed on Mg-Al6-Zn1 Alloy for Enhanced Wear and Corrosion Protection
- Authors
- Rehman, Zeeshan Ur; Koo, Bon Heun; Choi, Dongjin
- Issue Date
- Feb-2020
- Publisher
- MDPI
- Keywords
- fluoride ions; SEM; PEO; corrosion; wear; hardness
- Citation
- COATINGS, v.10, no.2
- Journal Title
- COATINGS
- Volume
- 10
- Number
- 2
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11819
- DOI
- 10.3390/coatings10020094
- ISSN
- 2079-6412
- Abstract
- The present study was carried out to explore the effect of SiF62- incorporation and concentration on the plasma electrolytic oxidation (PEO) coatings formed on AZ61 Mg alloy. The coatings were prepared using electrolyte solution with various concentration of Na2SiF6 (0.0-0.7 g/L). Highly compact coatings with minimum porosity were obtained for an optimum concentration of Na2SiF6 similar to 0.3 g/L added into the electrolyte. The highest corrosion resistance, similar to 2.04 x 10(5) ohm cm(2), was obtained for 0.3 g/L of Na2SiF6, in addition to its superior anti-wear properties. However, it was found from the scanning electron microscope (SEM) image analysis that increasing concentration above 0.3 g/L, could cause severe breakdown in the inner layers, and thus the said coatings could not withstand effectively against wear and corrosion.
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