Nanoparticle Concentration and Heat Treatment Effects on Microstructure and Tribological Behavior of the Ni-P Nanocomposite Coating

Authors

  • Behzad Rezaee Department of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran
  • Ehsan Kermani Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
  • Saeed Ejlali Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
  • Farid Biniyazan Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
  • Hamid Soleimanimehr Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran https://orcid.org/0000-0001-8931-5698

DOI:

https://doi.org/10.22034/advjscieng21022071

Keywords:

Electroless Ni-P coating, Nanocomposite, Nanoparticle concentration, Wear resistance

Abstract

The aim of this study was to create electroless Ni-P-SiO2-MoS2 nanocomposite coating and investigate the effect of the concentration of nanoparticles and heat treatment on its structure and tribological behavior. To achieve this purpose, MO40 steel specimens were coated at the temperature of 90°C in electroless nickel-phosphorus coating baths containing different concentrations of 3, 7, 11, and 15 g/L of SiO2 and MoS2 reinforcement nanoparticles with pH 6.4 for 60 minutes. Then, the coated sample containing 7 g/L of nanoparticles was subjected to heat treatment of 400°C for 60 minute. To investigate the microstructure, tribological behavior, elements’ weight percent and phases in the coatings, FE-SEM images were observed and wear test, EDS and XRD analysis were performed, respectively. Results showed that by increasing the concentration of nanoparticles in the coating bath, the weight percent of the reinforcement elements in the coating increases. Exceeding concentration of nanoparticles from certain value leads to the agglomeration of the coating particles and creation of porosity which results in a non-uniform coating with low protecting properties. Therefore, the appropriate concentration of nanoparticles in the coating bath was chosen 7 g/L, because the results show a uniform coating of the amorphous nickel phase and the SiO2 and MoS2 nanoparticles. Subsequently, the heat treatment results showed that the amorphous nickel phase formed in the coating became into two crystalline nickel and Ni3P phases after heat treatment that leads to increase wear resistance.

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Published

2021-06-30

How to Cite

Rezaee, B., Kermani, E., Ejlali, S., Biniyazan, F., & Soleimanimehr, H. (2021). Nanoparticle Concentration and Heat Treatment Effects on Microstructure and Tribological Behavior of the Ni-P Nanocomposite Coating. Advanced Journal of Science and Engineering, 2(2), 71–78. https://doi.org/10.22034/advjscieng21022071

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Original Research Article