Preparation of Graphite Coating on Nickel Substrate by Molten Salt Electrolysis

doi:10.12068/j.issn.1005-3026.2015.05.015

Abstract

Abstract: Graphite coating was prepared on nickel cathode by electrochemical reduction of carbonate ion in LiF-Li₂CO₃ molten salt. The electrochemical behavior of carbonate ion was investigated using cyclic voltammetry. The influences of temperature and deposition potential on surface morphology of the coating were studied by scanning electron microscopy and the property of the coating was analyzed. The results showed that the electrochemical reduction of carbonate ion to form carbon is an irreversible process. The cathode coating deposited at 690℃ and -1.5V is jagged combined between the carburized layer and nickel substrate. The surface of coating prepared at -1.1V has a spherical particles appearance， while the surface of coating prepared at -1.7V appears a whisker structure. The corrosion potential of nickel in 3.5%NaCl solution increases by 739mV because of the formation of graphite coating.

Key words: molten carbonate, electrodeposition, nickel, graphite, coating

CLC Number:

TF111.52⁺2

LI Liang-xing， LIU Ai-min， XIE Kai-yu， SHI Zhong-ning. Preparation of Graphite Coating on Nickel Substrate by Molten Salt Electrolysis[J]. Journal of Northeastern University Natural Science, 2015, 36(5): 675-679.

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