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Investigation of corrosion, hardness and wear resistant of electroless Ni-P/ Ni-P-ZrO2 nano-composite coatings

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Author Affiliations

  • 1Graphic Era Hill and Deemed University, Dehradun, India
  • 2THDC Institute of Hydropower Engineering and Technology Tehri, India
  • 3J.V. Jain (PG) College, Saharanpur, India
  • 4Graphic Era Hill and Deemed University, Dehradun, India

Res. J. Physical Sci., Volume 5, Issue (1), Pages 6-9, February,4 (2017)

Abstract

In current research investigation, Ni-P/ Ni-P-ZrO2 nano-composite depositions was developed by electroless deposition method on mild steel substrate in an acidic bath with sodium hypophosphite used as reducing agent. The second phase, ZrO2 nano-particles having content 5 gram per liter were add to the electroless bath for co-deposition along with Ni-P matrix. The heat treatment of as-deposited Ni-P/Ni-P-ZrO2 coatings was carried out at 360 oC in Argon atmosphere for 1hour duration. The depositions were analyzed for surface morphology, elemental composition and phase analysis by FESEM, EDAX and XRD analysis. The corrosion resistance behavior of depositions was studied in 3.5% NaCl solution by long term immersion corrosion experiment. From FESEM and EDAX data it has been observed that ZrO2 nano-particles are embedded uniformly in the as-plated and heat treated coatings. From the long term immersion test it has been observed that the corrosion resistant behavior of as-coated and heat treated Ni-P-ZrO2 coatings is better as compared to plain Ni-P coatings. The hardness and wear resistance of Ni-P-ZrO2 nano-composite coating has also been found enhanced in comparison to MS/Ni-P electroless depositions.

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