中国物理B ›› 2015, Vol. 24 ›› Issue (10): 108202-108202.doi: 10.1088/1674-1056/24/10/108202

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Surface morphology and electrochemical characterization of electrodeposited Ni–Mo nanocomposites as cathodes for hydrogen evolution

Elhachmi Guettaf Temam, Hachemi Ben Temam, Said Benramache   

  1. Laboratoire de Physique des Couches Minces et Applications, Université de Biskra, BP 145RP, Biskra 07000, Algérie
  • 收稿日期:2015-02-14 修回日期:2015-05-22 出版日期:2015-10-05 发布日期:2015-10-05

Surface morphology and electrochemical characterization of electrodeposited Ni–Mo nanocomposites as cathodes for hydrogen evolution

Elhachmi Guettaf Temam, Hachemi Ben Temam, Said Benramache   

  1. Laboratoire de Physique des Couches Minces et Applications, Université de Biskra, BP 145RP, Biskra 07000, Algérie
  • Received:2015-02-14 Revised:2015-05-22 Online:2015-10-05 Published:2015-10-05
  • Contact: Said Benramache E-mail:saidbenramache07@gmail.com

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摘要： In this work, we study the influences of current density on surface morphology and electrochemical characterization of electrodeposited Ni-Mo. The Ni-Mo composite coatings are deposited on pretreated copper substrates by electrolytic deposition. The Ni-Mo solution is taken from nickel sulfate fluid and ammonium heptamolybdate with 10 g/l. The Ni-Mo composite coatings are deposited at a temperature of 303 K with an applied current density of jdep= 10 A/dm2-30 A/dm2. We find that the corrosion resistance is improved by incorporating Mo particles into Ni matrix in 0.6-M NaCl solution. From the potentiodynamic polarization curve of electrodeposited Ni-Mo it is confirmed that the corrosion resistance decreases with increasing applied current density. The x-ray diffraction (XRD) analyses of Ni-Mo coatings indicate three phases of MoNi4, Mo1.24Ni0.76, and Ni3Mo phases crystallites of nickel and molybdenum. The scanning electronic microscopy (SEM) tests indicate that Ni-Mo coatings present cracks and pores.

关键词: Ni-Mo, electrolytic deposition, corrosion resistance, potentiodynamic polarization, plating current density

Abstract: In this work, we study the influences of current density on surface morphology and electrochemical characterization of electrodeposited Ni-Mo. The Ni-Mo composite coatings are deposited on pretreated copper substrates by electrolytic deposition. The Ni-Mo solution is taken from nickel sulfate fluid and ammonium heptamolybdate with 10 g/l. The Ni-Mo composite coatings are deposited at a temperature of 303 K with an applied current density of jdep= 10 A/dm2-30 A/dm2. We find that the corrosion resistance is improved by incorporating Mo particles into Ni matrix in 0.6-M NaCl solution. From the potentiodynamic polarization curve of electrodeposited Ni-Mo it is confirmed that the corrosion resistance decreases with increasing applied current density. The x-ray diffraction (XRD) analyses of Ni-Mo coatings indicate three phases of MoNi4, Mo1.24Ni0.76, and Ni3Mo phases crystallites of nickel and molybdenum. The scanning electronic microscopy (SEM) tests indicate that Ni-Mo coatings present cracks and pores.

Key words: Ni-Mo, electrolytic deposition, corrosion resistance, potentiodynamic polarization, plating current density

中图分类号:  (Electrochemical synthesis)

  • 82.45.Aa
82.45.Bb (Corrosion and passivation) 82.45.Mp (Thin layers, films, monolayers, membranes) 82.45.Hk (Electrolysis)