Effect of graphene on mechanical and anti-corrosion properties of TiO2-SiO2 sol-gel coating
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 16 September 2024
Issue publication date: 30 October 2024
Abstract
Purpose
This paper aims to explore how graphene can improve the mechanical and anti-corrosion properties of TiO2-SiO2 sol-gel coating. This sol-gel coating has been prepared on aluminum alloy substrate using graphene as both nano-filler and corrosion inhibitor.
Design/methodology/approach
To examine the effect of graphene on mechanical properties of sol-gel coating, the abrasion resistance, adhesion strength and scratch resistance of coating have been evaluated. To reveal the effect of graphene on the anti-corrosion property of coating for aluminum alloy, the electrochemical impedance spectroscopy (EIS) has been conducted in 3.5 Wt.% NaCl medium.
Findings
Scanning electron microscopy images indicate that graphene nanoplatelets (GNPs) have been homogeneously dispersed into the sol-gel coating matrices (at the contents from 0.1 to 0.5 Wt.%). Mechanical tests of coatings indicate that the graphene content of 0.5 Wt.% provides highest values of adhesion strength (1.48 MPa), scratch resistance (850 N) and abrasion strength (812 L./mil.) for the sol-gel coating. The EIS data show that the higher content of GNPs improve both R1 (coating) and R2 (coating/Al interface) resistances. In addition to enhancing the coating barrier performance (graphene acts as nanofiller/nano-reinforcer for coating matrix), other mechanism can be at work to account for the role of the graphene inhibitor in improving the anticorrosive performance at the coating/Al interface.
Originality/value
Application of graphene-based sol-gel coating for protection of aluminum and its alloy is very promising.
Keywords
Acknowledgements
The authors would like to thank the financial supports of the Vietnam Academy of Science and Technology – Vietnam – Belarus scientific cooperation program (Grant # QTBY01.08/23–24) and Belarusian Republican Foundation for Fundamental Research (Project T23V-009).
Citation
Kovalenko, D.L., Uong Van, V., Mac, V.P., Nguyen, T.V., Pham Thi, L., Nguyen, T.A., Gaishun, V.E., Vaskevich, V.V. and Tran, D.L. (2024), "Effect of graphene on mechanical and anti-corrosion properties of TiO2-SiO2 sol-gel coating", Anti-Corrosion Methods and Materials, Vol. 71 No. 6, pp. 820-830. https://doi.org/10.1108/ACMM-05-2024-3023
Publisher
:Emerald Publishing Limited
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