Black nickel electrodeposition from a modified Watts bath
Ibrahim, Magdy;
Abstract
Black nickel coatings were electrodeposited on to steel substrates from a Watts bath containing potassium nitrate.
The best operating conditions necessary to produce smooth and highly adherent black nickel were found to be
NiSO4 Æ 6H2O 0.63 M, NiCl2 Æ 6H2O 0.09 M, H3BO3 0.3 M and KNO3 0.2 M at pH of 4.6, i=0.5 A dm)2, T=25 C
and t=10 min. The modified Watts bath has a throwing power (TP) of 61%, which is higher than that reported, not
only for nickel, but also for many other metals electrodeposited from different baths. The potentiostatic current–
time transients indicate instantaneous nucleation. X-ray diffraction (XRD) analysis shows that the black nickel
deposit is pure metallic nickel with Ni(111) preferred orientation.
The best operating conditions necessary to produce smooth and highly adherent black nickel were found to be
NiSO4 Æ 6H2O 0.63 M, NiCl2 Æ 6H2O 0.09 M, H3BO3 0.3 M and KNO3 0.2 M at pH of 4.6, i=0.5 A dm)2, T=25 C
and t=10 min. The modified Watts bath has a throwing power (TP) of 61%, which is higher than that reported, not
only for nickel, but also for many other metals electrodeposited from different baths. The potentiostatic current–
time transients indicate instantaneous nucleation. X-ray diffraction (XRD) analysis shows that the black nickel
deposit is pure metallic nickel with Ni(111) preferred orientation.
Other data
Title | Black nickel electrodeposition from a modified Watts bath | Authors | Ibrahim, Magdy | Keywords | black nickel, current efficiency, electrodeposition, potentiodynamic, Tafel lines | Issue Date | 2006 | Publisher | Elsevier | Journal | Journal of Applied Electrochemistry | DOI | DOI 10.1007/s10800-005-9077-8 |
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