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Vol.31, No.1, 97 ~ 105, 1993

Title

Relationship in Electrodeposited Brass Phases and Their Dezincification in 5 N HCl Depending on electrolysis Conditions

양점식Jeom Shik Yang, 강수영Soo Young Kang, 이동녕Dong Nyung Lee

Abstract

Brass electrodeposits were obtained from cyanide baths at 45℃ under current densities from 0.5 to 10.0A/d㎡ and from a sodium tartrate bath at 35℃ under 1 to 20A/d㎡. The cathode current efficiency decreased and the zinc content in the brass deposits increased with increasing current density (overvoltage). The lattice parameter of the electrodeposited α-brass obtained from the cyanide baths increased linearly with increasing zinc content up to about 30% in accordance with equilibrium values, even though additives tended to a little decrease the zinc concentration from which β` started to co-deposit. On the other hand the α lattice parameters of the deposits obtained from the sodium tartrate bath were almost constant up to about 25% Zn due to codeposition of β`. The dezincification of the brass electrodeposits was more influenced by existence of β`phase rather than zinc contents. Theβ`phase thnded to increase tended dezincification.

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