Transactions of the Indian Institute of Metals

, Volume 71, Issue 6, pp 1301–1309 | Cite as

Deposition, Characterization and Evaluation of Monolayer and Multilayer Ni, Ni–P and Ni–P–Nano ZnOp Coatings

  • Ali Varmazyar
  • Saeed Reza Allahkaram
  • Soheil Mahdavi
Review Paper


Ni, Ni–P and Ni–P–ZnOp monolayer films along with multilayer coatings containing different arrangements of these layers were produced on steel substrates by electrodeposition and electroless deposition techniques. Co-deposition of ZnO nano-particles, as well as morphology, cross-section, microstructure and microhardness of coatings were investigated. Corrosion behaviors of monolayer coatings were studied by potentiodynamic polarization and electrochemical impedance spectroscopy techniques, and the results were compared to multilayer films. Results revealed that, Ni–P–1.5 vol% ZnOp monolayer film obtained from a bath with 4 g L−1 of these particles had the highest hardness between all samples. Further addition of nano-particles to the bath lead to the formation of discontinuous films. Most of the multilayer coatings with different arrangements exhibited higher corrosion resistance as compared to monolayer films. Corrosion current density of three-layer Ni–P–ZnOp/Ni/Ni–P coating, considered as the most corrosion resistant film, was about 538 times lower than monolayer Ni–P coating.


Ni–P Ni–P–ZnOp Multilayer coatings Electrodeposition Electroless deposition Corrosion 


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Copyright information

© The Indian Institute of Metals - IIM 2018

Authors and Affiliations

  • Ali Varmazyar
    • 1
  • Saeed Reza Allahkaram
    • 1
  • Soheil Mahdavi
    • 2
  1. 1.School of Metallurgy and Materials Engineering, College of EngineeringUniversity of TehranTehranIran
  2. 2.Research Center for Advanced Materials, Faculty of Materials EngineeringSahand University of TechnologyTabrizIran

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