Corrosion of Composite Ferro-Niobium Layers in Cobalt Matrix
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Date
2012Author
Balint, Lucica
Radu, Tamara
Balint, Simion Ioan
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The ferro-niobium composite layers in cobalt matrix were obtained by
cathode depositing from electrolyte solutions on steel base. The electrolyte included
in its composition cobalt sulphate and cobalt chloride, boric acid was also added
for pH stabilization. The ferro-niobium, powder with granulation smaller than 5μm,
niobium content of 98% and 2% iron, were introduced into the electrolyte with
20g/L concentration. Electrodepositing was performed at different current
densities: 615A/m2, 570A/m2, 458A/m2 and the result was layers of cobalt and
composite from ferro-niobium particles in cobalt matrix, with thickness varying
between 50 – 90μm. Corrosion resistance was assessed by linear voltammetry test
watching the corrosion behavior depending on composition and structure of
deposited layers. The potentiodynamic polarization curve was analysed for
composite layers compared with cobalt layers. From Tafel curves was determinated
the corrosion rate for each type of coatings.
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- 2012 fascicula9 nr3 [13]