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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 3    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 3,March 2012
A new and numerical approach to corrosion resistance of electrodeposited nanostructured Ni-Co coatings using a Watts bath under pulsed current
Full Text(PDF, )  PP.360-363  
Alireza Heidari, Niloofar Heidari, Foad Khademi Jahromi, Roozbeh Amiri, Mehrnoosh Zeinalkhani, Fatemeh Ghorbani, Azadeh Piri, Mohammadali Ghorban
In this study, we electrodeposited nanostructured nickel-cobalt coatings using a Watts bath under pulsed current. The plating was performed in the baths containing 0.5, 1, and 3 g/lit of saccharin at the current densities of 2, 4, and 6 A/dm2, different frequencies, and on-time spans. We investigated these coatings' morphology, chemical analysis, and crystallography using scanning electron microscope and energy dispersive spectrometer. The results of the Tafel polarization tests conducted in 3.5% sodium chloride solution indicated that increasing the coating's cobalt content (constant grain size) raises the corrosion rate, although the corrosion potential slightly declines. The reason is that cobalt is more active than nickel. Increasing the grain size decreases the corrosion rate and corrosion potential
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