EFFECT OF MAGNETIC CHARGING OF NI ON ELECTROLYTIC CODEPOSITION OF ZN WITH NI PARTICLES

摘要

Composite materials with unique properties can be produced by codepositing an inert phase during a cathodic metal deposition process. The feasibility of codeposition is mainly determined by the interaction of the inert phase and the cathodically deposited metal. When both the inert phase and the cathode or the cathodically deposited metal are ferromagnetic substances, codeposition can be promoted by magnetizing the inert phase prior to codeposition. Codeposition of Zn with Ni particles on a steel cathode from a weakly acidic zinc chloride based bath was investigated. The increased interaction between the magnetically remanent Ni particles and the steel cathode resulted in substantially higher percentages of Ni included in the deposit layer, especially at low concentrations of Ni particles in the bath. The model of Guglielmi, modified for conducting particles, proved to be valid; the value of adsorption parameter k(ad) changed with magnetic remanency. Cathodic Zn deposition efficiency decreased with increasing concentration of Ni particles in solution and increasing Ni content in the deposit. The principle outlined can also be applied to systems with nonferromagnetic inert phases by coating these with ferromagnetic substances. [References: 13]