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      https://www.ias.ac.in/article/fulltext/boms/035/06/0977-0988

    • Keywords

       

      Volume fraction; composite coatings; microstructure; scanning electron microscope; X-ray diffraction.

    • Abstract

       

      Electrodeposition of nickel/barium hexa-aluminate (Ni/BHA) composite coatings has been carried out from a Watt’s bath on mild steel substrate. BHA powders with plate habit were synthesized by solution combustion synthesis followed by heat treatment to ensure complete conversion to the hexa-aluminate phase. Heat treated material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) combined with X-ray analysis. The dispersion behaviour and stability of BHA suspensions with cationic and anionic surfactants at room temperature were studied by dynamic light scattering under different pH. The influence of BHA concentration in the electrolytic bath, deposition temperature, pH, current density and duty cycle on particle incorporation in the coatings were studied and conditions for maximum particle incorporation were established. Coatings with a roughness of about 0.4 𝜇m were produced by using this technique. Effect of BHA content on microhardness was also investigated. A reasonably good thickness of the coatings was achieved in a given set of conditions.

    • Author Affiliations

       

      Dinesh Kumar1 Sampada Gurav1 Vikram Jayaram1 Sanjay Kumar Biswas2

      1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India
      2. Department of Mechanical Engineering, Indian Institute of Science, Bangalore 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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