Ni/nano-TiO2 Composite Electrocoatings: Correlation Between Structural Characteristics Microhardness and Wear Resistance
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Stella Spanou
Abstract
Nanocomposite coatings were obtained by electrochemical codeposition of TiO2 nano-particles (mean diameter 21 nm, Degussa P25) with nickel, from an additive-free Watts type bath. Pure Ni and composite Ni-TiO2 coatings were electrolytically deposited under both direct and pulse current conditions and an extended region of electrolysis conditions (pH, current density, TiO2 loading in the bath). Pure Ni deposits were produced under the same experimental conditions for comparison. The aim of this study was to correlate the observed structural characteristics of the coatings (crystallographic orientation and grain size of nickel matrix,) and incorporation percentage with the resulting microhardness values and tribological behavior. Overall, the data have demonstrated that when attributing the observed strengthening effect of composites, not only grain refinement and dispersion strengthening mechanisms, but also preferred crystalline orientation should be taken into consideration. The variation of the wear rate is directly associated with the microhardness variations and consequently, governed by the same parameters that determine the synergistic strengthening mechanism proposed. Pure and composite coatings with [110] crystalline orientation exhibited the highest microhardness values and wear resistance.
© by Oldenbourg Wissenschaftsverlag, München, Germany
Articles in the same Issue
- Editorial
- New Features in Electroless Deposition of Ternary Coatings on the Base of Ni-P and Co-P
- Photo-Curing of off-set Printing Inks by Functionalized ZnO Nanoparticles
- Ni/nano-TiO2 Composite Electrocoatings: Correlation Between Structural Characteristics Microhardness and Wear Resistance
- Electrochemical Growth of Eosin Y/Manganese Doped ZnO as Hybrid Films and Nanowires
- Investigating the Hydrothermal Growth of Zinc Oxide Nanostructures Through Seed Layer Control
- Characterization of Electrodeposited NiCo Films with Incorporated Ferrite (BaFe12O19) Nano-Particles
- Synthesis and Agglomeration of Silver Nanoparticles Stabilized with 5-R-Tetrazoles
- Electrochemical Patterning of Polyaniline on Insulating Substrates
- Tribological Aspects of Carbon-Based Nanocoatings – Theory and Simulation
Articles in the same Issue
- Editorial
- New Features in Electroless Deposition of Ternary Coatings on the Base of Ni-P and Co-P
- Photo-Curing of off-set Printing Inks by Functionalized ZnO Nanoparticles
- Ni/nano-TiO2 Composite Electrocoatings: Correlation Between Structural Characteristics Microhardness and Wear Resistance
- Electrochemical Growth of Eosin Y/Manganese Doped ZnO as Hybrid Films and Nanowires
- Investigating the Hydrothermal Growth of Zinc Oxide Nanostructures Through Seed Layer Control
- Characterization of Electrodeposited NiCo Films with Incorporated Ferrite (BaFe12O19) Nano-Particles
- Synthesis and Agglomeration of Silver Nanoparticles Stabilized with 5-R-Tetrazoles
- Electrochemical Patterning of Polyaniline on Insulating Substrates
- Tribological Aspects of Carbon-Based Nanocoatings – Theory and Simulation
