The codeposition of non-metal particles and metal phases brings a significant improvement on the mechanical and physical properties of electro-coatings. The quality of the coatings depends mainly on the grain size of the matrix metal, and the volume percentage and distribution of the codeposited particles. The present project is to fabricate nanocomposites under the triangular waveform with relaxation time and to investigate their deposition behaviour. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were utilized to investigate surface morphology of nickel-SiC composites, and the volume percentages of silicon carbide particles were also determined.
Nanosized silicon carbide particles (β SiC) of diameter about 100nm were used in the experiments. It was found that the application of triangular waveform and SiC particles changed the shape of the nickel grain from a pyramid-like structure to a nodular-like structure, and reduced the average grain size of nickel matrix to about 30nm, comparing with those under direct current conditions.
The Guglielmi’s adsorption mechanism was extended to predict the volume percentage of silicon carbide particles in the codeposition process using direct current and triangular waveform with relaxation time. It was shown that the percentage of silicon carbide particles embedded in the coating could be increased by using a triangular waveform current. The trend of the predicted volume percentage was found in good agreement with the experimental results.

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