Preparation and Characterization of Autocatalytic Ni-P-A12O3 NANO composite coatings

Balaraju, JN and Kalavati, - and Rajam, KS (2004) Preparation and Characterization of Autocatalytic Ni-P-A12O3 NANO composite coatings. In: International Convention on Surface Engineering, 25-27, Bangalore.

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    Abstract

    High phosphorus electroless nickel bath has been used to prepare nanocomposite coatings containing nano alumna powders (50 and 300 nm). Deposits were characterized by XRD, optically, by SEM and DSC for its structure, morphology and phase transformation behavior. A single broad peak is observed with a grain size of I .6 nm for both composite coatings. More incorporation was found in composite coatings obtained with 300 nm (C2) alumina particles compare to 50 nm (CI) alumina particles. A single xothermic peak was found for both composite coatings around 340°C. A marginal improvement in hardness was noticed in as plated composite coatings. A 20% increase in microhardness was observed in the heattreated (400°C for 1 hour) for C1 and C2 coatings. Potentiodynamic polarization measurements were also made on these deposits in 3.5% sodium chloride solution.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Electroless nickel, nanocomposites, SEMI DSC, hardness, corrosion resistance.
    Subjects: CHEMISTRY AND MATERIALS > Composite Materials
    Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
    Depositing User: Ms Indrani V
    Date Deposited: 29 Jun 2010 14:35
    Last Modified: 29 Jun 2010 15:40
    URI: http://nal-ir.nal.res.in/id/eprint/8461

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