SciELO - Scientific Electronic Library Online

vol.37 issue3Elaboration, Electrochemical Investigation and morphological Study of the Coating Behavior of a new Polymeric Polyepoxide Architecture: Crosslinked and Hybrid Decaglycidyl of Phosphorus Penta methylene Dianiline on E24 Carbon Steel in 3.5% NaCl author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • Have no similar articlesSimilars in SciELO


Portugaliae Electrochimica Acta

Print version ISSN 0872-1904


MUKHOPADHYAY, Arkadeb; BARMAN, Tapan Kumar  and  SAHOO, Prasanta. Corrosion Resistance of Electroless Ni-B-W-Mo Coatings using Electrochemical Impedance Spectroscopy. Port. Electrochim. Acta [online]. 2019, vol.37, n.3, pp.193-203. ISSN 0872-1904.

Quaternary Ni-B-W-Mo coatings were deposited on AISI 1040 steel by the electroless method. Some of the specimens were heat-treated at 300, 350, 400, 450 and 500 °C, for 1 hour. The deposited coatings contained a high weight percentage of W, and a low B content was detected by energy dispersive X-ray analysis. The coatings in as-deposited state were amorphous, and heat treatment resulted in crystallization with the precipitation of borides. W and Mo were present in the coatings, mainly in a solid solution form. The surface morphology study revealed densely nodulated structures, which are pertinent for sodium borohydride reduced electroless nickel coatings. Electrochemical impedance spectroscopy studies were conducted to determine the corrosion resistance of the as-deposited and heat-treated coatings in a 3.5% NaCl electrolyte. The corroded surfaces were observed under scanning electron microscope, to study the corrosion mechanism.

Keywords : electroless nickel; Ni-B-W-Mo; coating and corrosion resistance.

        · text in English     · English ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License