Cobalt-Nickel Electrolytes Containing Phosphite or Benzoate Additive Developed for Magnetic Plating
Open Access
- 1 January 1964
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 111 (11) , 1244-1248
- https://doi.org/10.1149/1.2425969
Abstract
Two cobalt‐nickel electroplating baths were developed for magnetic plating with coercivities in the range from 200 to 400 oe. One bath contained phosphite as the additive (and active agent) for control of coercivity; the other bath contained benzoate as the additive. Both electrolytes had long plating life and coercivities were relatively unaffected by small changes in temperature, pH, and current density such as would be normally encountered in operation of the baths. Two phases are present in the plate. One phase, containing the additive, is a very fine grained amorphous‐phase which is resistant to attack by acid and is nonmagnetic; the other phase is crystalline and is more readily attacked by acid. The coercivity of the plate is controlled by the particle size of the crystalline component in the amorphous matrix.Keywords
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