Effect of Nano-Al₂O₃ Particles on the NiP/nano-Al₂O₃ Coatings’ Properties

Abstract:

Composite coatings were prepared using electroless nickel bath containing different concentrations of Al₂O₃ nano-particles. The analyses of coating compositions, carried out by EDS, showed that there is marginal difference between phosphorus contents of NiP and NiP/nano-Al₂O₃ deposits. The structure of the coatings was examined by scanning electron microscopy (SEM), and X-ray diffraction (XRD). It has been found that the co-deposition of nano-Al₂O₃ particles with Ni disturbs the NiP coating’s regular surface structure and increases its surface roughness. DC and AC electrochemical tests were carried out on such coatings in a 3.5wt.% solution of NaCl in order to evaluate their corrosion resistance. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests both showed that, the corrosion resistance of NiP-Al₂O₃ coatings firstly increases and then decreases when Al₂O₃ concentration in electroless bath is increasing, but the corrosion resistance of NiP-Al₂O₃ composite coating is better than that of amorphous NiP coating.

• Periodical: Applied Mechanics and Materials (Volumes 66-68)
• Pages: 1668-1675
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.66-68.1668
• Online since: July 2011
• Authors: Xue Tao Yuan, Zhi Qiang Hua, Lei Wang, Dong Bai Sun, Song Lin Chen
• Keywords: Corrosion Resistance, Electrochemical Impedance Spectroscopy (EIS), Electroless Ni–P/Nano-Al₂O₃ Composite Coating, Nanoparticle, X-Ray Diffraction (XRD)

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