Abstract

HOSSEINI, J.  and  BODAGHI, A.. Corrosion Behavior of Electroless Ni-P-TiO₂ Nanocomposite Coatings and Optimization of Process Parameters Using Taguchi Method. Port. Electrochim. Acta [online]. 2013, vol.31, n.1, pp.11-20. ISSN 0872-1904.  https://doi.org/10.4152/pea.201301011.

This paper reports an experimental study of corrosion characteristics of electroless NiP- TiO₂ nanocomposite coatings. Coating process parameters are optimized for maximum corrosion resistance based on L₉ Taguchi orthogonal design with four process parameters, viz., concentration of nickel source solution, concentration of reducing agent, concentration of TiO₂ powder and bath temperature. Corrosion behavior of the electroless Ni-P-TiO₂ nanocomposite coatings was evaluated in 3.5 wt.% NaCl aqueous solution by using polarization technique. Scanning electron microscope (SEM) and Energy dispersive X-ray spectroscopy (EDS) analysis were used for studying the surface morphology and chemical composition of the electroless Ni-P-TiO₂ nanocomposite coatings. The results showed that incorporation of TiO₂ in coating causes increasing of corrosion resistance and improves surface morphology. Finally, optimum conditions were achieved as, concentration of nickel source solution: 50 g L^-1 , concentration of reducing agent: 10 g L^-1, concentration of TiO₂ powder: 10 g L^-1, and bath temperature of 85 °C.

Keywords : electroless Ni-P-TiO₂; nanocomposite; Taguchi method; corrosion resistance; polarization measurements.

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