Effect of Doping of Nanoparticles on the Properties of Zn-Ni Composite Coatings

Abstract:

The purpose of this paper was to investigate the effect of Al₂O₃ and TiO₂ nanoparticles contents on structural proporties, microhardness and corrosion resistance of Zn-Ni alloy coationg. Zn-Ni, Zn-Ni-Al₂O₃ and Zn-Ni-TiO₂ composite coatings were electrodeposited on steel substrate by direct current in sulphate bath.The structure of the coatings was studied by X-ray diffration and by scaning electron miroscopy. The results showed the appearance of Ni₅Zn₂₁ phases and that the incrorporation of Al₂O₃ and TiO₂ in the Zn-Ni coating refined the crystal grain size.The corrosion performance of coating in the 0.6M NaCl as a corrisive solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy EIS methods. It was found that the incorporation of nanoparticules in Zn-Ni alloy coating have better corrosion resistance and the values of Rct and Zw increase, while the values of Cdl decrease with increasing of nanoparticules.

• Periodical: Diffusion Foundations (Volume 18)
• Pages: 19-26
• DOI: https://doi.org/10.4028/www.scientific.net/DF.18.19
• Online since: September 2018
• Authors: Nadjette Belhamra*, Abd Raouf Boulebtina, Khadidja Belassadi, Abdelouahad CHALA, Malika Diafi
• Keywords: Corrosion, Electrodeposition, Morphology, Nanoparticles, Zn-Ni Coating

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