Investigating the morphology and nanostructure of Ni-Fe alloy coatings prepared by electrodeposition

Subject Areas :

سارا فضلی ¹ , محمد ابراهیم بحرالعلوم ²

1 - فارغ التحصیل دانشگاه شیراز
2 - استاد دانشگاه شیراز

Received: 2015-04-29 Accepted : 2015-06-06 Published : 2016-05-21

Keywords: Roughness, Morphology, temperature, Coating, Ni-Fe, saccharin, agitation,

Abstract :

In this study, electrodeposition method was used to prepare Ni-Fe alloy coatings in a new composition of a bath. Temperature, the concentration of saccharin and the method of agitation during electrodeposition were investigated as three different contributing factors which influenced the morphology, structure and the composition of the coatings. 3 hours electrodeposition was performed at 25, 45 and 75°C, with the pH of 3.8 and applying 100mA/cm2 with the existence of different amount of saccharin (1,3,5 and 10g/L) in the bath. The SEM images and X-ray diffraction pattern showed a cauliflower and nanocrystalline structure (26.65nm). Elemental analysis showed that increasing of temperature caused an increasing in the concentration of Ni in the coatings, which was attributed to the increasing of the nickel solubility, the conductivity and the efficiency and decreasing the polarization. In addition, increasing the temperature decreased the grain size and the roughness of coatings. 1g/L was determined as the optimum amount of saccharin in the bath, which decreased the grain size of coatings due to its prevention of growing rate. Further amount of saccharin increased the roughness, which was attributed to the existence of more saccharin particles in the coatings. Because of the magnetic nature of the alloy coatings, the magnetic stirrer changed the morphology and structure of Ni-Fe alloy coatings. Finally, the optimum circumstances to deposit adhesive coating with the minimum pit, internal strain and impurity was obtained with the existence of 1g/L saccharin at 25°C and mechanical agitation during plating.

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