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An investigation over the effect of the reducing agent on the properties of the ZnO-reinforced Ni–P coatings

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Abstract

Electroless ZnO-reinforced Ni–P coatings are developed on mild steel substrates in the Electroless bath, which contains an optimum concentration of ZnO nanoparticles. This work focuses on the characteristics and properties of the Ni–P–ZnO coatings developed at different concentrations of reducing agent (sodium hypophosphite). Results confirm that the reducing agent greatly influences the deposition rate, surface roughness, hardness, and corrosion resistance of the coating. Reducing agent concentration influences the phosphorus present in the coating. An increase in the amorphous nature of the coating with an increase in reducing agent concentration improves the resistance to corrosion of the coating, but at the same time, it decreases the microhardness of the coating. High phosphorus deposition at the maximum amount of reducing agent concentration lowers the microhardness of the coating. The Hard Ni3P crystalline phase formed at 400 °C enhances the resistance to corrosion and microhardness of the coating. Scanning electron microscopy and X-ray diffraction studies are used to characterize the Ni–P–ZnO coating. The microhardness and corrosion resistance of the coating were evaluated using a Vickers microhardness tester and potentiodynamic polarization studies.

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Acknowledgements

One of the authors, Vinod Babu Chintada and Thirumala Rao Gurugubelli, wishes to express their gratitude to the GMRIT management for providing financial assistance through the SEED grant for the research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, GMR Institute of Technology, GMR Nagar, Rajam, Andhra Pradesh, 532127, India

    Vinod Babu Chintada

  2. Physics Division, Department of Basic Sciences and Humanities, GMR Institute of Technology, GMR Nagar, Rajam, Andhra Pradesh, 532127, India

    Thirumala Rao Gurugubelli

  3. Department of Robotics and Intelligent Machine Engineering, College of Mechanical and IT Engineering, Yeungnam University, Gyeongsan, 712-749, Republic of Korea

    Ravindranadh Koutavarapu

Authors
  1. Vinod Babu Chintada
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  2. Thirumala Rao Gurugubelli
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  3. Ravindranadh Koutavarapu
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Correspondence to Vinod Babu Chintada, Thirumala Rao Gurugubelli or Ravindranadh Koutavarapu.

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Chintada, V.B., Gurugubelli, T.R. & Koutavarapu, R. An investigation over the effect of the reducing agent on the properties of the ZnO-reinforced Ni–P coatings. J Mater Sci: Mater Electron 33, 950–958 (2022). https://doi.org/10.1007/s10854-021-07366-4

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  • DOI: https://doi.org/10.1007/s10854-021-07366-4

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