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Coatings 2017, 7(12), 214;

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

Colloids and Materials Chemistry Department, CSIR—Institute of Minerals and Materials Technology, Bhubaneshwar 751013, India
Author to whom correspondence should be addressed.
Academic Editor: Giovanni Zangari
Received: 1 October 2017 / Revised: 20 November 2017 / Accepted: 22 November 2017 / Published: 30 November 2017
(This article belongs to the Special Issue Electrophoretic Deposition)
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In this paper, we report the use of a simple and inexpensive electrophoretic deposition (EPD) technique to develop thin, uniform, and transparent graphene oxide (GO) coating on copper (Cu) substrate on application of 10 V for 1 s from an aqueous suspension containing 0.03 wt % graphene oxide. GO was partially reduced during the EPD process itself. The GO coated on Cu was completely reduced chemically by using sodium borohydride (NaBH4) solution. The coatings were characterized by field emission scanning electron microscope (FESEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), XRD, and UV/VIS spectrophotometry. Corrosion resistance of the coatings was evaluated by electrochemical measurements under accelerated corrosion condition in 3.5 wt % NaCl solution. The GO coated on Cu and chemically reduced by NaBH4 showed more positive corrosion potential (Ecorr) (−145.4 mV) compared to GO coated on Cu (−182.2 mV) and bare Cu (−235.3 mV), and much lower corrosion current (Icorr) (7.01 µA/cm2) when compared to 15.375 µA/cm2 for bare Cu indicating that reduced GO film on copper exhibit enhanced corrosion resistance. The corrosion inhibition efficiency of chemically reduced GO coated Cu was 54.40%, and its corrosion rate was 0.08 mm/year as compared to 0.18 mm/year for bare copper. View Full-Text
Keywords: graphene; electrophoretic deposition; corrosion prevention; copper graphene; electrophoretic deposition; corrosion prevention; copper

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Usha Kiran, N.; Dey, S.; Singh, B.P.; Besra, L. Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention. Coatings 2017, 7, 214.

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