J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (1): 82-86.

• Thin Film and Coatings • Previous Articles     Next Articles

Effect of Electroplating Parameters on Microstructure of Nanocrystalline Nickel Coatings

A.M. Rashidi, A. Amadeh   

  1. 1) Faculty of Engineering, Razi University, P.O. Box 67149-67346, Kermanshah, Iran
    2) School of Metallurgy & Materials Engineering, University College of Engineering, University of Tehran, Tehran, Iran
  • Received:2008-10-16 Revised:2009-08-06 Online:2010-01-31 Published:2010-01-22
  • Contact: A. Amadeh

Abstract:

In order to achieve the optimum conditions for electroplating nanocrystalline nickel coating from Watts-type bath, the effect of some process parameters namely, bath temperature, current density, and saccharin addition on grain size and texture coefficient (TC= I(200) /I(111) ) of the deposits were investigated by X-ray diffraction
(XRD). The results showed that in a bath containing 5 g/L saccharin, by increasing the bath temperature from 45°C to 55°C, the grain size decreased, whereas further increase of bath temperature resulted in a contrary effect. By increasing the current density from 10 to 75 mA/cm2, both the grain size and TC decreased, while further increase in current density had no significant effect on the grain size. At a given current density, the grain size and TC decreased rapidly by increasing the saccharin content before leveling off at 3 g/L of saccharin. Finally, based on the grain refining the optimum conditions for producing nanocrystalline nickel coating from Watts-type bath have been proposed.

Key words: Electroplating, Grain size, Nanocrystalline, Coating