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Coatings 2017, 7(12), 210; https://doi.org/10.3390/coatings7120210

Long-Term Corrosion Protection of a Cupro-Nickel Alloy Due to Graphene Coating

1
Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia
2
Department of Mechanical Engineering, Bansal Institute of Research and Technology, Kokta, Anand Nagar, Bhopal 462021, India
3
Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Alessandro Lavacchi
Received: 20 September 2017 / Revised: 28 October 2017 / Accepted: 13 November 2017 / Published: 23 November 2017
View Full-Text   |   Download PDF [4465 KB, uploaded 28 November 2017]   |  

Abstract

This study demonstrates the corrosion resistance of a Cu-Ni alloy coated with a multi-layer graphene. This is one of the first demonstrations of long-term corrosion resistance due to graphene coating, which is crucial since earlier studies have suggested graphene-coated copper to be considerably inferior to bare copper in terms of corrosion during long-term exposure to a corrosive environment. The inferior corrosion resistance of graphene-coated copper arises due to defects and poor surface coverage by graphene. Since it is prohibitively difficult to develop defect-free graphene on metals at a commercially feasible scale, this study investigated the hypothesis for an alternative approach, i.e., to develop multi-layer graphene with a reasonable assumption that the areas of defects/poor coverage of a layer will be masked by the subsequent over-layer(s). This study has validated this hypothesis. Electrochemical investigations have demonstrated multi-layer graphene to improve the corrosion resistance of a Cu-Ni alloy by an order of magnitude. However, the most striking finding of this study is that the improvement in corrosion resistance due to the multi-layer graphene coating sustained the entire duration of a long-term test (~350 h). View Full-Text
Keywords: Cu-Ni alloy; graphene; EIS; Raman spectroscopy; chemical vapour deposition; corrosion Cu-Ni alloy; graphene; EIS; Raman spectroscopy; chemical vapour deposition; corrosion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tiwari, A.; Singh Raman, R.K. Long-Term Corrosion Protection of a Cupro-Nickel Alloy Due to Graphene Coating. Coatings 2017, 7, 210.

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