Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish
authors Mennucci, MM; Montes, R; Bastos, AC; Monteiro, A; Oliveira, P; Tedim, J; Ferreira, MGS
nationality International
author keywords black nickel coatings; electrochemical testing; electrodeposition; hull cell; nanostructured coatings
abstract Featured Application The black coatings described in this work find application in decorative finishes, optical instruments, and photovoltaic modules. This work compares different electrodeposition procedures to produce nickel black coatings as greener and less toxic alternatives to Cr(VI)-based coatings used in different applications. Nickel and nickel-plated brass served as substrates in studies with a Hull cell and polarization curves. After a set of comparative experiments, the best electrodeposition procedure was further studied and optimized. Optimal conditions were found with a bath consisting of 75 g/L NiCl2 center dot 6H(2)O + 30 g/L NaCl and a current density of 0.143 A dm(-2) applied for 5 min at room temperature. Furthermore, a pre-treatment with 18.5 vol.% of hydrochloric acid in water was found to be necessary to warrant good coating adhesion to the substrate. The black color is attributed to the development of a nanostructured surface that absorbs the incident light. Corrosion testing was performed in 0.5 M NaCl aqueous solution using electrochemical impedance spectroscopy (EIS) and polarization tests.
publisher MDPI
isbn 2076-3417
year published 2021
volume 11
issue 9
digital object identifier (doi) 10.3390/app11093924
web of science category 13
subject category Chemistry, Multidisciplinary; Engineering, Multidisciplinary; Materials Science, Multidisciplinary; Physics, Applied
unique article identifier WOS:000649902600001
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journal impact factor 2.474
5 year journal impact factor 2.458
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