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EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND CORROSION RESISTANCE OF Ni-B-W-Mo COATING DEPOSITED BY ELECTROLESS METHOD

Author

Listed:
  • ARKADEB MUKHOPADHYAY

    (Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India)

  • TAPAN KUMAR BARMAN

    (Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India)

  • PRASANTA SAHOO

    (Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India)

Abstract

The present work reports the deposition of a quaternary Ni-B-W-Mo coating on AISI 1040 medium carbon steel and its characterization. Quaternary deposits are obtained by suitably modifying existing electroless Ni-B bath. Composition of the as-deposited coating is analyzed by energy dispersive X-ray spectroscopy. The structural aspects of the as-deposited and coatings heat treated at 300∘C, 350∘C, 400∘C, 450∘C and 500∘C are determined using X-ray diffraction technique. Surface of the as-deposited and heat-treated coatings is examined using a scanning electron microscope. Very high W deposition could be observed when sodium molybdate is present in the borohydride-based bath along with sodium tungstate. The coatings in their as-deposited condition are amorphous while crystallization takes place on heat treatment. A nodulated surface morphology of the deposits is also observed. Vickers’ microhardness and crystallite size measurement reveal inclusion of W and Mo results in enhanced thermal stability of the coatings. Solid solution strengthening of the electroless coatings by W and Mo is also observed. The applicability of kinetic strength theory to the hardening of the coatings on heat treatment is also investigated. Corrosion resistance of Ni-B-W-Mo coatings and effect of heat treatment on the same are also determined by electrochemical techniques.

Suggested Citation

  • Arkadeb Mukhopadhyay & Tapan Kumar Barman & Prasanta Sahoo, 2018. "EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND CORROSION RESISTANCE OF Ni-B-W-Mo COATING DEPOSITED BY ELECTROLESS METHOD," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 25(08), pages 1-15, December.
    • Handle: RePEc:wsi:srlxxx:v:25:y:2018:i:08:n:s0218625x19500239
    DOI: 10.1142/S0218625X19500239
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