The Guglielmi's two successive adsorption step model for the codeposition of inert particles from electroplating baths has been applied to the phenol resin particles/zinc system to elucidate deposition mechanism of the resin particles. It was found that the coverage of strongly adsorbed particles, calculated from the amount of particles contained in the composite films by using Guglielmi and Saifullin equations, is nearly equal to the fraction of the particles obtained from the SEM observation. The resin particles were initially adsorbed to the cathode by the electrophoretic effect. However, only the particles strongly adsorbed by the electrostatic force were embedded in the growing metal deposit, as shown in the Guglielmi's model. This is not the case when the bath is vigorously agitated. The amount of particles codeposition in the composite film depends on the probability of the collision of particles with cathode. A modified mechanism for the mechanical deposition of particles has been proposed.
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