Production and Characterization of Sol-Enhanced Zn- Ni-Al2O3 Nanocomposite Coating

Authors: Soroor Ghaziof, Wei Gao

Abstract:

Sol-enhanced Zn-Ni-Al2O3 nanocomposite coatings were electroplated on mild steel by our newly developed solenhanced electroplating method. In this method, transparent Al2O3 sol was added into the acidic Zn-Ni bath to produced Zn-Ni-Al2O3nanocomposite coatings. The chemical composition, microstructure and mechanical properties of the composite and alloy coatings deposited at two different agitation speed were investigated. The structure of all coatings was single γ-Ni5Zn21 phase. The composite coatings possess refined crystals with higher microhardness compared to Zn-Ni alloy coatings. The wear resistance of Zn-Ni coatings was improved significantly by incorporation of alumina nano particles into the coatings. Higher agitation speed provided more uniform coatings with smaller grain sized and slightly higher microhardness. Considering composite coatings, high agitation speeds may facilitate co-deposition of alumina in the coatings.

Keywords: Microhardness, Sol-enhanced electro plating, Wear resistance, Zn-Ni-Al2O3 composite coatings.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1106923

References:

[1] B.M. Praveen, and T. V. Venkatesha, "Electrodeposition and corrosion resistance properties of Zn-Ni/TiO2nano composite coatings" Int. J. Electrochem., vol. 2011, pp. 1-4, June 2011.
[2] W. Wang, F. Hou, H. Wang and H. Guo, "Fabrication and characterization of Ni-ZrO2 composite nano-coatings by pulse electrodeposition" Scr. Mater., vol. 53, pp. 613-618, Sep. 2005.
[3] R. Oberle, M. Scanlon, R. Cammarata, P. Searson, "Processing and hardness of electrodeposited Ni/Al2O3 nanocomposites" Appl. Phys. Lett., vol. 66, pp. 19-21, Jan. 1995.
[4] Y. Boonyongmaneerat, S. Saenapitak, K. Saengkiettiyut, "Reverse pulse electrodeposition of Zn-Ni alloys from a chloride bath" J. Alloys Compounds, vol. 487, pp. 479-482, Nov. 2009.
[5] M. M. Abou-Krisha, "Effect of pH and current density on the electro deposition of Zn-Ni-Fe alloys from a sulfate bath" J. Coat. Tech. Res., vol. 9, pp.775-783, 2012.
[6] D. Blejan, D. Bogdan, M. Pop, A.V. Pop and L. M. Muresan, "Structure, morphology and corrosion resistance of Zn-Ni-TiO2 composite coatings" Optoelectron. Adv. Mater., vol. 5, pp. 25-29, Jan. 2011.
[7] H. Zheng and M. An, "Electrodeposition of Zn-Ni-Al2O3nanocomposite coatings under ultrasound conditions" J Alloys Compounds., vol. 459, pp. 548-552, July 2008.
[8] Y. Yang, W. Chen, C. Zhou, H. Xu, W. Gao, "Fabrication and characterization of electroless Ni-P-ZrO2nano-composite coatings" Appl. Nanosci., vol. 1, pp. 19-26, May 2011.
[9] W. Chen, Y. He, W. Gao, "Electrodeposition of sol-enhanced nanostructured Ni-TiO2 composite coatings" Surf. Coat. Tech., vol. 204, pp. 2487-2492, Apr. 2010.
[10] W. Chen, Y. He, W. Gao, "Synthesis of nanostructured Ni-TiO2 composite coatings by sol-enhanced electroplating" J. Electrochem. Soc., vol 157, pp. 122-128, June 2010.
[11] A. Gomes, I. Almeida, T. Frade and A. C. Tavares, "Stability of Zn-Ni- TiO2 and Zn-TiO2nanocomposite coatings in near-neutral sulphate solutions" J. Nanoparticle Res., vol. 14, pp. 692-704, Jan. 2012.
[12] A. Gomes, I. Almeida, T. Frade and A. C. Tavares, "Zn-TiO2 and ZnNi- TiO2nanocomposite coatings: Corrosion behaviour" Mater. Sci. Forum, vols. 636-637, pp. 1079-1083, Jan (2010).
[13] P. C. Tulio, S. E. B. Rodrigues and I. A. Carlos, "The influence of SiC and Al2O3 micrometric particles on the electrodeposition of ZnNi films and the obtainment of ZnNi-SiC and ZnNi-Al2O3electrocomposite coatings from slightly acidic solutions" Surf. Coat. Tech. vol. 202, pp. 91-99, Nov. 2007.
[14] M. R. Kalantary, G. D. Wilcox and D. R. Gabe, "The production of compositionally modulated alloys by simulated high speed electrodeposition from a single solution" Electrochim. Acta., vol. 40, pp. 1609-1616, Aug. 1995.
[15] S. Ghaziof, W. Gao, "The effect of pulse electroplating on Zn-Ni alloy and Zn-Ni-Al2O3 composite coatings" J. Alloys Compounds., vol. 622, pp. 918-924, Feb. 2015.
[16] C. T. J. Low, R. G. A. Wills and F. C. Walsh, "Electrodeposition of composite coatings containing nanoparticles in a metal deposit" Surf. Coat. Tech., vol. 201, pp. 371-383, Sep. 2006.
[17] F. Elkhatabi, M. Benballa, M. Sarret and C. Müller, "Dependence of coating characteristics on deposition potential for electrodeposited Zn-Ni alloys" Electrochim. Acta., vol. 44, pp. 1645-1653, Jan. 1999.
[18] A. Damjanovic, T. Setty, J. Bockris, "Effect of crystal plane on the mechanism and the kinetics of copper electrocrystallization" J. Electrochem. Soc., vol. 113, pp. 429-440, May 1966.