Method to electroplate nickel-phosphorus coating with improved current efficiency

Embodiments of the present invention provide a method for electroplating high-phosphorus nickel-phosphorus coatings with improved cathodic current efficiency. The method includes an electrolyte containing nickel ions and phosphorus acid, and a pulse current waveform. The parameters of the current wa...

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Bibliographic Details
Main Authors LEE, CHUN-YING, CHIEN, CHIH-TAO, LIN, CHAO-SUNG, LIN, PAI-LI, CHEN, FU-JE, CHUNG, WEI CHIH
Format Patent
LanguageChinese
English
Published 01.03.2007
Subjects
APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Summary:Embodiments of the present invention provide a method for electroplating high-phosphorus nickel-phosphorus coatings with improved cathodic current efficiency. The method includes an electrolyte containing nickel ions and phosphorus acid, and a pulse current waveform. The parameters of the current waveform include the pulse current density, on-time, off-time, pulse frequency and duty cycle. For pulse electroplating, nickel ions and phosphorus acid at cathode/solution interface, which are consumed to form nickel-phosphorus electrodeposits, can be replenished via diffusion during the off-time period. This replenishment leads to an increase in the deposit phosphorus content while retains a relatively current efficiency.
Bibliography:Application Number: TW20050129793