Influence of pulse parameters on the mechanical properties and electrochemical corrosion behavior of electrodeposited Ni-W alloy coatings with high tungsten content

•Pulse current electrodeposition of Ni-W alloy coatings with high W content.•Improved corrosion resistance below a critical W content of 23 at % W.•Corrosion resistance is related to thin and defective WO3 passive film.•Nanocrystalline Ni-W coatings are more corrosion resistant than duplex nanocryst...

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Bibliographic Details
Published in:Corrosion science 2020-04, Vol.165, p.108409, Article 108409
Main Authors: Wasekar, Nitin P., Hebalkar, Neha, Jyothirmayi, A., Lavakumar, B., Ramakrishna, M., Sundararajan, G.
Format: Article
Language:English
Subjects:
Coated electrodes
Composition
Corrosion
Corrosion currents
Corrosion resistance
Corrosion resistant alloys
Electrochemical corrosion
Electrochemical impedance spectroscopy
Electrode polarization
Electrodeposition
Mechanical properties
Mott–Schottky
Nanocrystals
Nickel base alloys
Nickel tungsten
Oxide coatings
Parameters
Photoelectrons
Radioactive wastes
Spectrum analysis
Sulfuric acid
Tungsten
XPS
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Summary:•Pulse current electrodeposition of Ni-W alloy coatings with high W content.•Improved corrosion resistance below a critical W content of 23 at % W.•Corrosion resistance is related to thin and defective WO3 passive film.•Nanocrystalline Ni-W coatings are more corrosion resistant than duplex nanocrystalline and amorphous structure. Ni-W alloys with 16–28 at% tungsten (W) content were electrodeposited from citrate bath utilizing various pulse parameters. The influence of pulse parameters on microstructure, composition and mechanical properties was systematically studied. The corrosion behavior was analyzed in 1 M H2SO4 using potentiodynamic polarization and electrochemical impedance spectroscopy. Nanocrystalline Ni-W coatings were found to have superior corrosion resistance compared to their duplex nanocrystalline-amorphous counterpart. The corrosion behavior was rationalized based on semiconducting properties of oxide film using Mott–Schottky analysis and depth wise composition analysis utilizing X-ray Photoelectron Spectroscopy. An attempt is made to correlate corrosion current with intercrystalline defects.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108409