Electroless nickel composite coatings containing solid lubricant MoS2 particles

Ezhil Selvi, V and Mimosa, Sarma and Balaraju, JN (2013) Electroless nickel composite coatings containing solid lubricant MoS2 particles. In: NSEST 2013, 2013-08-23, IISc, Bangalore.

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Nickel–Phosphorous–Molybdenum disulphide composite coatings were prepared using electroless nickel bath containing Molybdenum disulphide (MoS2) particles. Plain Ni-P coatings were also prepared for comparison. Sodium Lauryl Sulphate (SLS) as a surfactant was used to disperse the second phase MoS2 particles in the bath. Thickness of the composite coatings was around 30-40 µm with incorporated 1.5 wt. % MoS2 particles. Field emission scanning electron microscopy (FESEM) studies showed that the surface morphology of the deposits was found to be rough compared to plain Ni-P deposits. Compositional analysis (EDAX) results showed that the plain Ni-P coating contains about 10 wt.% P. Incorporation of phosphorus content was not affected with the second phase MoS2 particles inclusion. Differential Scanning Calorimetry (DSC) studies on the deposits showed a marginal increase in the crystallization temperature compared to plain Ni-P deposits indicating improved thermal stability. Composite coatings exhibited microhardness almost similar to plain Ni-P deposits both in as-deposited and heat treated (400o C for 1 hour) conditions. Structural studies carried out on these deposits indicated a single broad Ni (111) peak. In the case of composite coatings presence of additional peaks corresponding to MoS2 (103) and (105) were observed. To evaluate the electrochemical behaviour of these coatings potentiodynamic polarization and electrochemical impedance measurements were carried out and results were discussed.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Electroless nickel;Compositional analysis;Field emission scanning electron microscopy (FESEM);Differential Scanning Calorimetry (DSC)
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Mrs Manoranjitha M D
Date Deposited: 24 Jul 2015 09:56
Last Modified: 28 Oct 2015 07:01
URI: http://nal-ir.nal.res.in/id/eprint/12253

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