We describe an electrochemical method for the formation of composite electrochemical coatings and foils based on nickel and reinforced with nanosized aluminum oxide from a sulfamate electrolyte. We propose a mechanism of formation of composites and a mathematical model that reflects the relationship between the content of the hardening phase in composite electrochemical coatings and the concentration of Al2O3 hydrosol in the electrolyte. The influence of Al2O3 nanoparticles on the morphology and grain sizes of the composites is established by the methods of SEM and X-ray microanalysis. We determine the topography of composite electrochemical coatings and foils by the method of atomic force microscopy and establish the formation of a uniformly globular structure after the addition of Al2O3. The incorporation of nanosized particles of Al2O3 into the matrix of the base metal promotes a decrease in the grain size and the improvement of the mechanical properties of the composites: the microhardness and ultimate strength of the composites become 1.5–2 times higher and a substantial increase in the yield strength (as compared with nickel coating) is observed. The corrosion resistance of the composite electrochemical coatings increases as a result of the incorporation of aluminum oxide particles and, according to the depth index of corrosion k h = 10- 3 mm/yr we can attribute Ni–Al2O3 to the group of corrosion-resistant materials.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 53, No. 3, pp. 76–85, May–June, 2017.
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Sakhnenko, М.D., Ved’, М.V. & Ovcharenko, О.О. Physicomechanical Properties of Composite Electrochemical Coatings and Foils Based on Nickel and Reinforced with Al2O3 . Mater Sci 53, 374–384 (2017). https://doi.org/10.1007/s11003-017-0085-8
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DOI: https://doi.org/10.1007/s11003-017-0085-8