Journal
SURFACE ENGINEERING
Volume 36, Issue 9, Pages 952-959Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670844.2019.1660035
Keywords
Multilayer; electrodeposition; corrosion; nickel tungsten; residual stress; hard chrome; EIS; porosity
Categories
Funding
- Science and Engineering Research Board [SB/EMEQ-222/2013]
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The present study deals with corrosion behaviour of compositionally modulated nanocrystalline Ni-W alloy coatings and conventional hard chrome coatings. Compositionally modulated Ni-W alloy coatings of known composition were systematically deposited using pulse current deposition. The corrosion behaviour was analysed using potentiodynamic polarization and impedance spectroscopy in 2N H2SO4. Compositionally modulated Ni-W alloy coatings depicted substantial improvement in corrosion resistance over its single-layer counterpart and hard chrome coatings. The corrosion behaviour was rationalized based on porosity and surface residual stresses present in these coatings.
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