Electro-Deposition of Nano-Structured Ni Coatings

Date
2013-02-04
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Abstract
Electro-deposition is versatile method for producing metal composite coatings on surfaces for protection against wear and corrosion. The electro-deposition of nano-sized ceramic composite coatings is novel and offers coatings with superior properties compared to conventional pure metallic coatings. The co-deposition process can provide a cost effective solution to coat complex geometries and internal surfaces of components or hard to reach surfaces with high degree of control on coat thickness and characteristics. In this research nickel composite coatings was co-electrodeposited with 3 different types of ceramic oxide particles (Y2O3, TiO2, or Al2O3). The effect of electroplating parameters on the distribution of these nano-sized particles and the impact of this distribution on mechanical and physical properties were examined. It was found that the type of ceramic dispersoids used directly affected the coat hardness, with the highest value produced with Al2O3 dispersion (600VHN), followed by Y2O3 (550VHN) and then TiO2 (500VHN). Furthermore, the type of ceramic used and the values of different plating parameters changed the deposition rates, the cohesive strength of the coating and the extent of agglomeration of these nano particles within the coating. A mechanism was proposed to describe the agglomeration phenomena and the key factors that affect it, aiming at finding the optimum ranges that controls the extent of particles agglomeration within the coatings, and then the experimental observations were used to validate this mechanism.
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Keywords
Materials Science, Engineering--Mechanical, Metallurgy
Citation
Elgezary, M. (2013). Electro-Deposition of Nano-Structured Ni Coatings (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/25861