Effect of N₂H₄ on Electrodeposition of Ni-Graphene Composite Coatings and their Corrosion Resistance Property

Abstract:

The Ni-graphene composite coatings were prepared by electrochemical deposition method, using nickel sulfate and graphene as primary reagents. Pure Ni coatings, Ni-graphene coatings with N₂H₄ and Ni-graphene coatings without N₂H₄ were prepared from three different but similar electrolytes. The N₂H₄ added into the solution is for complexation with NiSO₄ to settle the Ni ions. Graphene used in this work is characterized by TEM and HRTEM. The reaction of N₂H₄ with NiSO₄ is characterized by XRD and optical graphs. The composite coatings’ morphology, structure and corrosion resistance were characterized by SEM and Potentiodynamic polarization test, respectively. The results show that well dispersed graphene–nickel coatings can be prepared with N₂H₄ in the electrolyte. By comparison with the situation that electrolyte without N₂H₄, graphene agglomerated at the surface of nickel coatings. The grain of the coatings prepared with and without N₂H₄ shows similar sizes. Ni-graphene coatings exhibit poor anticorrosion property by comparison with pure Ni coatings because of the defects (cracks and roughness on composite coatings with and without N₂H₄ in the solution, respectively) on the surface of graphene nickel coatings. These results provide a basis viewpoint for the further research of graphene-metallic composite coatings’ anticorrosion effect.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 192-199
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.192
• Online since: April 2015
• Authors: Quan Yao Yu, Ying Xin Zhang, Zhen Zhen Liu, Zhi Xiang Zeng*, Xue Dong Wu, Qun Ji Xue
• Keywords: Composite Coatings, Corrosion Resistance, Electrodeposition, Graphene, N₂H₄

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