Journal of Applied Electrochemistry

, Volume 22, Issue 3, pp 240–246 | Cite as

An experimental study of mass transfer in pulse reversal plating

  • J. Y. Wang
  • D. Balamurugan
  • D-T. Chin
Papers

Abstract

An experimental study has been made of the limiting pulse current density for a periodic pulse reversal plating of copper on a rotating disc electrode from an acidic copper sulfate bath containing 0.05m CuSO4 and 0.5M H2SO4. The measurements were made over a range of the electrode rotational speeds of 400–2500 r.p.m., pulse periods of 1–100 ms, cathodic duty cycles of 0.25–0.9, and dimension-less anodic pulse reversal current densities of 0 to 50. The experimental limiting pulse current data were compared to the theoretical prediction of Chin's mass transfer model. A satisfactory agreement was obtained over the range of a dimensionless pulse period ofDT/δ2=0.001−1; the root mean square deviation between the theory and 128 experimental data points was ±8.5%.

Keywords

Duty Cycle Copper Sulfate Disc Electrode Pulse Period Rotate Disc Electrode 

Notation

Cb

bulk concentration of the diffusing ion (mol cm−3)

Cs

surface concentration of the diffusing ion (mol cm−3)

D

diffusivity of the diffusing ion (cm2 s−1)

F

Faraday's constant (96 500C equiv−1)

i

current density (A cm−2)

i1

cathodic pulse current density (A cm−2)

i3

anodic pulse reversal current density (A cm−2)

i3*

dimensionless anodic pulse reversal density defined asi3/✓ilim

ilim

cathodic d.c. limiting current density (A cm−2)

ilim, a

anodic d.c. limiting current density (A cm−2)

iPL

cathodic limiting pulse current density (A cm−2)

iPL*

dimensionless limiting pulse current density defined asiPL/ilim

m

dummy index in Equation 1

n

number of electrons transferred in the electrode reaction (equiv/mol)

l

time (s)

t1

cathodic pulse time (s)

i3

anodic pulse reversal time (s)

T

pulse period equal tot1+t3 (s)

T*

pulse period defined asDT/δ2 (dimensionless)

Greek letters

δ

thickness of the steady-state Nernst diffusion layer (cm)

ν

electrode potential (V)

νde

time-averaged electrode potential (V)

λm

eigenvalues given by Equation 2 (dimensionless)

θ1

cathodic duty cycle (dimensionless)

θ3

anodic duty cycle in pulse reversal plating (dimensionless)

ν

kinematic viscosity (cm2 s−1)

ω

electrode rotational speed (rad s−1)

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References

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • J. Y. Wang
    • 1
  • D. Balamurugan
    • 1
  • D-T. Chin
    • 1
  1. 1.Department of Chemical EngineeringClarkson UniversityPotsdamUSA

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