Corrosion behaviour of electrodeposited nanocrystalline Ni–W and Ni–Fe–W alloys

The present work deals with evaluation of corrosion behaviour of electrodeposited nanocrystalline Ni–W and Ni–Fe–W alloys. Corrosion behaviour of the coatings deposited on steel substrates was studied using polarization and electrochemical impedance spectroscopy techniques in 3.5% NaCl solution whil...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-07, Vol.460, p.39-45
Main Authors: Sriraman, K.R., Ganesh Sundara Raman, S., Seshadri, S.K.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion behaviour
Corrosion mechanisms
Corrosion prevention
Electrodeposition
Exact sciences and technology
Metals. Metallurgy
Nanocrystalline coatings
Nickel–iron–tungsten alloys
Nickel–tungsten alloys
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Summary:The present work deals with evaluation of corrosion behaviour of electrodeposited nanocrystalline Ni–W and Ni–Fe–W alloys. Corrosion behaviour of the coatings deposited on steel substrates was studied using polarization and electrochemical impedance spectroscopy techniques in 3.5% NaCl solution while their passivation behaviour was studied in 1N sulphuric acid solution. The corrosion resistance of Ni–W alloys increased with tungsten content up to 7.54 at.% and then decreased. In case of Ni–Fe–W alloys it increased with tungsten content up to 9.20 at.% and then decreased. The ternary alloy coatings exhibited poor corrosion resistance compared to binary alloy coatings due to preferential dissolution of iron from the matrix. Regardless of composition all the alloys exhibited passivation behaviour over a wide range of potentials due to the formation of tungsten rich film on the surface.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2007.02.055