Electrodeposition of Ni-W-P alloy
https://doi.org/10.31615/j.corros.prot.2020.95.1-7
Abstract
Influence of sodium hypophosphite admixture to electrolyte for deposition of Ni-W alloy on the coating composition, morphology, structure and microhardness is investigated. Antisymbatic dependence of tungsten and phosphorus content in Ni-W and Ni-W-P alloys on the sodium hypophosphite concentration in the electrolyte is observed, namely, at higher sodium hypophosphite concentration in the electrolyte solution the coatings are become poorer in tungsten whereas phosphorus content is increased. Phosphorus incorporation into the alloy leads to globular morphology of the surface of coatings. The minimal roughness was obtained at high hypophosphite concentrations in the electrolyte (7.5 and 10 g/L). As-deposited Ni-W and Ni-W-P alloys possess nanocrystalline structure manifested in broad X-ray diffraction peaks. Addition of 2.5…5 g/L of hypophosphite markedly weakens Ni reflections (200) and (220), the (111) peaks becomes broader. In addition, a Ni3P phase is appeared in the coatings. Thermal treatment in vacuum at 400 °С induces growth of nickel crystallites. Microhardness of as-deposited coatings is weakly dependent on sodium hypophosphite concentration in the electrolyte and is in the range 3.8…4.2 GPa. Thermal treatment of Ni-W-P alloys at 400 °С during 1 h increases microhardness up to 5.9…8.8 GPa
About the Authors
S. S. Adilova
D. Mendeleev University of Chemical Technology of Russia
Russian Federation
Russian Federation
Sabina S. Adilova, student
9, Miusskaya sq., Moscow
A. B. Drovosekov
Frumkin Institute of Physical Chemistry and Electrochemistry of RAS
Russian Federation
Russian Federation
Andrey B. Drovosekov, Ph.D. in Chemistry, senior researcher
31/4, Leninskiy pr., Moscow
A. D. Aliev
Frumkin Institute of Physical Chemistry and Electrochemistry of RAS
Russian Federation
Russian Federation
Ali D. Aliev, Ph.D. in Physics and Mathematics, leading researcher
31/4, Leninskiy pr., Moscow
A. A. Shiryaev
Frumkin Institute of Physical Chemistry and Electrochemistry of RAS
Russian Federation
Russian Federation
Andrey A. Shiryaev, Doctor of Chemistry, leading researcher
31/4, Leninskiy pr., Moscow
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Review
For citations:
Adilova S.S., Drovosekov A.B., Aliev A.D., Shiryaev A.A. Electrodeposition of Ni-W-P alloy. Theory and Practice of Corrosion Protection. 2020;25(1):51-58. (In Russ.) https://doi.org/10.31615/j.corros.prot.2020.95.1-7
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