Effects of Different Surfactants on Structural, Tribological and Electrical Properties of Pulsed Electro-Codeposited Cu-
- PDF / 4,368,203 Bytes
- 12 Pages / 593.972 x 792 pts Page_size
- 98 Downloads / 185 Views
JMEPEG (2018) 27:1854–1865 https://doi.org/10.1007/s11665-018-3296-8
Effects of Different Surfactants on Structural, Tribological and Electrical Properties of Pulsed Electro-Codeposited Cu-ZrO2 Composite Coatings H.S. Maharana and A. Basu (Submitted April 26, 2017; in revised form February 9, 2018; published online March 20, 2018) Cu-ZrO2 composite coating was synthesized by pulse electrodeposition from an acidic sulfate electrolyte dispersed with nano-sized ZrO2 particles. Effects of different surfactants in different amounts on the codeposition and distribution of ZrO2 particles in the copper matrix, surface-mechanical (hardness and wear) and electrical (conductivity) properties of developed composite coatings have been thoroughly investigated. Sodium dodecyl sulfate (SDS), poly acrylic acid (PAA) and glucose have been added in the electrolyte in different concentrations as anionic, polymeric and nonionic surfactants. Obtained experimental results confirmed that addition of SDS up to 1 g/L improves the amount of codeposited ZrO2 particles in the copper matrix and surface-mechanical properties of the nanocomposite coatings. But, in case of PAA- and glucose-assisted coatings, highest amount of ZrO2 codeposition was observed in 0.5 g/L PAA and 20 g/L glucose-assisted coatings, which in turn affected the mechanical properties. Surfacemechanical properties were found to be affected by coating matrix morphology and crystallographic orientation along with embedded ZrO2 particle content. Electrical conductivity of all the deposits not only depends upon the codeposition of ZrO2 particles in the matrix but also on the microstructure and crystallographic orientation. Keywords
conductivity, copper, electrodeposition, surfactant, wear
1. Introduction Particle reinforced composite coating can be produced by electroplating method of co-depositing insoluble particles of metallic or non-metallic compounds such as oxides, carbides, borides, nitrides, diamond, graphite in the plated layer to improve various material properties such as hardness, wear resistance, lubrication and corrosion resistance (Ref 1-3). Copper electroplates possess unique combination of properties such as high electrical and thermal conductivity, good ductility and good corrosion resistance at ambient atmosphere; but, poor mechanical (hardness and wear resistance) properties are main concerns for various electrical applications, specifically for electrical contacts. In order to increase or modify the poor mechanical properties of copper coatings, second phase hard particles (Ref 4-14) were incorporated to copper matrix by different researchers in recent years. Nanocomposite coatings prepared by pulse electrodeposition are used in large number of applications due to its unique range of properties such as high strength, better wear and corrosion resistance compared to conventional DC electrodeposition (Ref 15). However, these properties of the developed coatings primarily depend on the morphology of the coated matrix and the amount of second phase particles in
Data Loading...
