Abstract
Composite coating of reduced graphene oxide (RGO) and poly (4-vinylpyridine-co-butyl methacrylate) (PVPBM) on copper was produced by electrophoretic deposition (EPD) technique. The structural and morphological characterizations of the RGO-PVPBM coating were carried out using a Raman spectrometer and a field emission scanning electron microscope, respectively. The thermal stability of the coating was analyzed by thermo-gravimetric analysis, and the corrosion resistance properties were examined by potentiodynamic polarization measurements and electrochemical impedance spectroscopy in 3.5% NaCl solution. At optimal EPD conditions of operating voltage of 5 V and total deposition time of 15 min, a uniform crack-free RGO-PVPBM composite coating is obtained. The microscratch experiment has shown an enhancement in the crack propagation resistance of RGO-PVPBM composite coating up to 3.7 times and adhesive strength increased ~2 times compared to PVPBM coating, thereby making it a potential damage tolerance surface coating on Cu substrate. The potentiodynamic measurements clearly show that RGO-PVPBM acts as a protective coating for Cu in 3.5% NaCl solution. The corrosion inhibition efficiency for RGO-PVPBM coating was calculated to be 95.4% which clearly indicates that the tailored RGO-PVPBM composite is an excellent barrier coating to ion diffusion and corrosive electrolyte with considerably enhanced corrosion resistance.
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Acknowledgments
The authors would like to thank Prof. B.K. Mishra, former Director of CSIR IMMT, Bhubaneswar, for his helpful suggestions and comments. Thanks are due to Prof. S. Rath, IIT Bhubaneswar for extending Raman facility for this work. The authors are also equally thankful to Dr. SoobhankarPati and Mr. U.K. Chanda, IIT Bhubaneswar, for the electrochemical test. The authors would like to thank Mr. S. Bajpai, IMMT, Bhubaneswar, for availing the microscratch test for this work. The research work is financially supported by Department of Science and Technology (DST), Government of India, Reference No. SR/WOS-A/ET-92/2013 under Women Scientist Scheme.
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Kumari, S., Panigrahi, A., Singh, S.K. et al. Enhanced corrosion resistance and mechanical properties of nanostructured graphene-polymer composite coating on copper by electrophoretic deposition. J Coat Technol Res 15, 583–592 (2018). https://doi.org/10.1007/s11998-017-0001-z
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DOI: https://doi.org/10.1007/s11998-017-0001-z