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

Subject Areas :

سارا  فضلی ¹ (فارغ التحصیل دانشگاه شیراز)
محمد ابراهیم  بحرالعلوم 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.

References:

[1]     S. Glasstone “The cathodic behavior of alloys. I. Iron-nickle alloys”, Trans. Faraday Soc., Vol. 19, pp. 574-583, 1924.

 

[2]       م. رستمی، ر. ابراهیمی و احمد ساعتچی، "اثر افزایش مقدار نانو ذرات SiC بر سختی پوشش های نانو کامپوزیتی Ni-SiC-Gr، حاصل از آبکاری الکتریکی"، فرآیندهای نوین در مهندسی مواد، دوره 6، شماره 1، صفحه 97-104، 1391.

 

[3]     D. C. Wang & J. B. Talbot, “Microstructural Study of Gradient Copper-Alumina Films Electrodeposited Using A Rotating Cylinder Electrode”, Morphological Evolution in Electrodeposition, 19^thMeeting Program Information Jl, Washington, 2001.

 

[4]     J. Fustes, A. Gomes & P. da Silva, “Electrodeposition of Zn-TiO₂ Nanocomposite films- Effect of Bath Composition”, J.Solid State Electrochem, Vol. 12, pp. 1435-1443, 2008.

 

[5]       ا. آقایی، ع. نصراصفهانی، ا. یعقوبی زاده و ا. ر.خضرلو، " بررسی تأثیر غلظت ذرات SiC در الکترولیت بر خواص تریبولوژیکی پوشش‌ کامپوزیتی Ni-SiC حاصل از آبکاری الکترولیتی با جریان منقطع"، فرآیندهای نوین در مهندسی مواد، دوره 8، شماره 3، صفحه 99-106، 1393.

 

[6]     W. Matthew, J. Losey & J. Kelly, “Electrodeposition”, Comprehensive Microsystems, Vol. 1, pp. 271–292, 2008.

 

[7]     A. Brenner, “Electrodeposition of alloys”, Academic Press, New York and London, Vol. 2, pp. 265-277, 1963.

 

[8]     R. Abdel-Karim, Y. Reda, M. Muhammed, S. El-Raghy, M. Shoeib & H. Ahmed, “Electrodeposition and Characterization of Nanocrystalline Ni-Fe Alloys”, Journal of Nanomaterials, Vol. 1, pp. 921-929, 2011.

 

[9]     W. Blum & G. B. Hogaboom. “Principle of  electroplating and electroforming”, McGraw-Hill Book Company, Inc, New York, Toronto, London, Vol. 3, pp. 356-382, 1949.

 

[10] I. W. Wolf, & V. P. Mcconnell, “Nickel-iron alloy electrodeposits for magnetic shielding”, Proc. Am. Electroplater’s Soc, pp. 215-218, 1956.

 

[11] I. W. Wolf, “Further studies on nickel-iron alloy electrodeposits”, Proc. Am. Electroplater’s Soc, pp. 121-123, 1957.

 

[12] A. Afshar, A. G. Dolati & M. Ghorbani, “Electrochemical characterization of the Ni–Fe alloy electrodeposition from chloride–citrate–glycolic acid solutions”, Materials Chemistry and Physics, Vol. 77, PP. 352–358, 2003.

 

[13] E. Moti, M. H. Shariat & M. E. Bahrololoom, “Electrodeposition of Nanocrystalline Nickel by using Rotating Cylindical Electrodes”, Materials Chemistry and Physics, Vol. 11, pp. 469-474, 2008.