عنوان مجله
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DIAMOND AND RELATED MATERIALS
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چکیده
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This study reports the production of functional Ni-Co/graphene coating obtained by pulse-reverse current (PRC)
electrodeposition method in Ni-Co plating bath containing graphene (Gr) to be co-deposited. Effects of graphene
concentration on the morphology, microstructure, microhardness, and electrochemical behaviour of the resulting
Ni-Co/graphene thin film were investigated. It was found that Gr introduced into the electrolyte and its concentration
affected the composition as well as the structure of the composite coatings. A higher Gr concentration
in the electroplating bath led to a higher Co concentration in Ni-Co alloy coatings. Ni-Co alloys and Ni-Co/Gr
composite coatings exhibited a compact surface under PRC current, an average crystallite size in the range of
8–10 nm, and a solid solution structure of Ni (Co). The electrochemical behaviour of the composite coating
improved with increasing Gr content, but decreased with higher Gr concentration (0.8 g/l). Ni-Co/Gr nanocomposite
coating also exhibited a higher microhardness of 610 HV than monolithic Ni-Co coating of 458 HV.
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