A study on electrodeposition of Ni-noncovalnetly treated carbon nanotubes nanocomposite coatings with desirable mechanical and anti-corrosion properties

作者：Daneshvar Fatah Farhad; Nasirpouri Farzad^*

来源：Surface and Coatings Technology, 2014, 248: 63-73.

DOI：10.1016/j.surfcoat.2014.03.023

• Carbon nanotubes
• Nickel
• Electrodeposition
• Metal matrix nanocomposite coating
• Corrosion properties
• Nano-indentation

In this study, we report on the successful incorporation of non-covalently functionalized multi-wall carbon nanotubes (MWCNTs) in electrodeposition bath using a multi-step dissolution to enhance dispersing and untangling. We observed that a saturation concentration exists for CNT dispersion in the electrodeposition solution and consequently an optimum condition for electrodeposition of Ni-MWCNT was obtained at a current density of 4 A/dm(2), and CNT concentration of 2 g/I. X-ray diffraction spectrum revealed a remarkable effect of CNTs on the texture, crystallite size, and internal micro-strain of the coatings. On the basis of nanoindentation and micro-hardness tests, increased hardness and elastic modulus of the coatings were observed which directly depend upon CNT content of the composite coating. Corrosion study results in 3.5% sodium chloride solution showed that corrosion rate decreases with increase in CNT content, though the corrosion rate is directly influenced by nickel crystallite size.