Original scientific paper
https://doi.org/10.5599/jese.135
Preparation and properties of electrodeposited Ni-TiO2 composite coating
Sukhdev Singh Bhogal
; National Institute of Technical Teachers and Research, Sector-26, Chandigarh, India
Vijay Kumar
; Punjab Technical University Campus, SAS Nagar (Mohali)-Punjab, India
Sukhdeep Singh Dhami
; National Institute of Technical Teachers and Research, Sector-26, Chandigarh, India
Bahadur Singh Pabla
; National Institute of Technical Teachers and Research, Sector-26, Chandigarh, India
Abstract
The mechanical properties of cutting tools, such as microhardness, corrosion resistance, and coating adhesiveness, directly affect the tool life and indirectly affect the component cost. In this paper, Ni-TiO2 composite coating was prepared through electrocodeposition in order to improve the mechanical properties of tungsten carbide cutting tools. The microhardness of the Ni-TiO2 composite layer was studied by varying the input current density (mA cm-2), pH value of the electrolyte, and particle concentration of TiO2 in electrolyte bath. The microstructure and phase structure of the composite layer were investigated using atomic force microscopy , scanning electronic microscopy and X-ray diffraction. The surface morphology of the Ni-TiO2 coated layer shows fine-grained structures and higher microhardness at lower currents. The maximum microhardness of the coated layer, 1483 HV, is found at a current of 15 mA cm-2 and Watts solution pH of 4.5. It is observed that with the increase of TiO2 content, the microhardness of the coating also increases.
Keywords
Microhardness; Electrocodeposition; Ccomposite layers
Hrčak ID:
136654
URI
Publication date:
15.3.2015.
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