Studies on surface structure, morphology and composition of Co-W coatings electrodeposited with direct and pulse current using gluconate bath

Bera, Parthasarathi and Seenivasan, H and Rajam, KS (2013) Studies on surface structure, morphology and composition of Co-W coatings electrodeposited with direct and pulse current using gluconate bath. Surface Review and Letters, 20 (1).

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    Abstract

    Co-W alloy coatings were deposited with direct current (DC) and pulse current (PC) electrodeposition methods using gluconate bath at pH5 and characterized by XRD, FESEM, AFM, DSC and XPS. DSC studies hint the possibility of formation of metallic glasses. Detailed XPS studies of these alloy coatings have been carried out to compare elemental states and composition of Co and W in DC and PC electrodeposited alloys. DC plated alloy has significant amount of Co and W metal along with their respective oxidized species. In contrast, mainly oxidized metals are present in the following layers of as-deposited coatings prepared with PC plating. Concentration of Co metal is observed to increase during sputtering, whereas there is no change in W6+ concentration. Microhardness measurement of all the Co−W coatings shows higher hardness compared to Co metal and 1:1 and 1:4 PC electrodeposited coatings show little higher hardness compared to 1:2 PC electrodeposited coating.

    Item Type: Journal Article
    Additional Information: Copyright to this article belongs to M/s. World Scientific Publishing Company
    Uncontrolled Keywords: Co�W coating;Electrodeposition;Gluconate bath;XPS
    Subjects: AERONAUTICS > Aeronautics (General)
    CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
    Depositing User: Ms. Alphones Mary
    Date Deposited: 09 May 2014 13:57
    Last Modified: 28 Oct 2015 12:49
    URI: http://nal-ir.nal.res.in/id/eprint/11959

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