Growth of graphene as anti-corrosive coating

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Copyright: Ji, Dali
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Abstract
Corrosion is a naturally occurring phenomenon in metals, regarded as an aggravating economic problem globally. By using proper corrosion control methods, the loss because of corrosion can be cut at least one third. A feasible method to slow down the corrosion rate is by coating a substrate with a stable and anticorrosive layer to protect substrates from oxidizing elements. However, those traditional protective coatings have their limitations such as poor stability or high thickness. Some believe exploiting a new protective coating could be a possible way to release these problems. Graphene-based materials have shown potential in the anticorrosion area due to its inert behavior. The objective of this thesis is to study the corrosion mechanism of graphene-based materials and study graphene as a large-area anticorrosive coating for copper. The corrosion behaviour of graphene and graphene oxide has been investigated. Our study suggests that graphene grown by chemical vapor deposition (CVD) process is better anticorrosive material in comparison to graphene oxide which is mainly to the defects in graphene oxide. We have electrochemical analysis to study the anticorrosion properties of graphene grown under varying CVD conditions. We have optimized CVD conditions to grow graphene with best anticorrosive characteristics in the larger area. Moreover, we used readily available ethanol as the carbon source to grow high-quality graphene films without hydrogen on copper surface. Raman spectroscopy was used to study the structural properties of graphene on copper. Electrochemical impedance spectroscopy has been used to study the anticorrosion behaviour of the CVD grown graphene layer. The observed corrosion rate of 8.08×10-14 m/s for graphene-coated copper is 24 times lower than the value for pure copper which shows the potential of graphene as the anticorrosive layer.
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Author(s)
Ji, Dali
Supervisor(s)
Joshi, Rakesh
Sahajwalla, Veena
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Publication Year
2020
Resource Type
Thesis
Degree Type
Masters Thesis
UNSW Faculty
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