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Open AccessArticle

Corrosion Protection of Monel Alloy Coated with Graphene Quantum Dots Starts with a Surge

School of Chemistry and Materials Science, Rochester Institute of Technology, Rochester, NY 14623, USA
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ChemEngineering 2019, 3(4), 80; https://doi.org/10.3390/chemengineering3040080
Received: 9 August 2019 / Revised: 6 September 2019 / Accepted: 23 September 2019 / Published: 30 September 2019
(This article belongs to the Special Issue Carbon-Based Materials and Their Electrochemical Applications)
There has been an active interest in protecting metals and alloys using graphene coating. The mechanism by which corrosion protection occurs has not been well understood as the couple involved are both good electron conductors. In this work, we demonstrate that Monel alloy coated with graphene quantum dots (GQD) changes the corrosion rate with a surge (increase) caused by the galvanic coupling of the two materials. This surge results in the protective layer formation on Monel to inhibit the corrosion. X-ray fluorescence spectrum of Monel (400) alloy showed the composition of it as Ni (67.05%) and Cu (29.42%). The Tafel experiments carried out in NaCl and Na2SO4 electrolytes showed an initial enhancement of the corrosion rate followed by a decrease upon successive polarizations. Monel coated with graphene oxide (an insulator) shows no initial enhancement of corrosion rate; the coated samples showed a lower corrosion rate in comparison to the uncoated samples. X-ray fluorescence, Fourier Transform spectroscopy (FTIR) and Raman imaging studies have been carried out for understanding this transformation. Distinct peaks due to Ni-O stretching and Ni-O-H bending vibration were observed in the FTIR spectrum. View Full-Text
Keywords: corrosion; graphene; Tafel; X-ray fluorescence; Raman imaging; Fourier transform infrared spectroscopy; Monel; nickel hydroxide corrosion; graphene; Tafel; X-ray fluorescence; Raman imaging; Fourier transform infrared spectroscopy; Monel; nickel hydroxide
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Bopp, C.; Santhanam, K. Corrosion Protection of Monel Alloy Coated with Graphene Quantum Dots Starts with a Surge. ChemEngineering 2019, 3, 80.

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