TITLE:
Corrosion of Nanocrystalline Ni-W Coated Copper
AUTHORS:
Christos N. Panagopoulos, Georgios D. Plainakis, Maria G. Tsoutsouva
KEYWORDS:
Nickel, Tungsten, Coating, Corrosion
JOURNAL NAME:
Journal of Surface Engineered Materials and Advanced Technology,
Vol.5 No.2,
February
3,
2015
ABSTRACT: The present study is dealing with the corrosion of copper coated with nanocrystalline nickeltungsten
coating. Different plating bath compositions and conditions were used in order to produce
nickel-tungsten coatings of different tungsten content 30%, 40% and 50% wt, with a thickness
of 20 μm. The corrosion resistance of nickel-tungsten alloy coated copper was examined by a
potentiodynamic polarisation technique in NaCl solution (0.03 M, 0.3 M and 1 M) as a function of
pH (3, 7, 10) and temperature (7°C, 30°C, 40°C) of the solution. It has been found that the pH value
did not seem to affect the corrosion behaviour of the coated specimen remarkably, while the increase
of solution temperature increased the corrosion rate of the coated copper specimen. It was
finally confirmed that the corrosion products mainly consisted of tungsten and nickel oxides.