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

Arkadeb Mukhopadhyay, Tapan Kumar Barman and Prasanta Sahoo
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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

Surface Review and Letters (SRL), 2018, vol. 25, issue 08, 1-15

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.

Keywords: Electroless coating; Ni-B-W-Mo; thermal stability; heat treatment; microhardness; corrosion resistance (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X19500239

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