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Información tecnológica

versión On-line ISSN 0718-0764

Resumen

MOLINA, Jarol E  y  HOYOS, Bibian A. Mathematical Model for the Electrochemical Nucleation with Pulse Current Waveforms. Inf. tecnol. [online]. 2007, vol.18, n.5, pp.31-40. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642007000500005.

A mathematical model has been established for the description of concentration overpotential, nucleation rate and nucleus size formed on metallic substrates when four types of pulse current waveforms are used: rectangular, ramp-down, ramp-up and triangular. The mathematical model was developed considering that the species diffusion in the limit layer is the rate determining step of the process. The model predicts that when using wave current with the same current average and the same time of application, the ramp-down current produces the shortest transition time, with the highest rise of overpotential concentration, this drives to high nucleation rates with small nucleus size. For the case of current wave forms with the same pick and average current, the rectangular and ramp-down waves show practically the same transition time, with equivalent nucleation rate and deposit size.

Palabras clave : electrochemical nucleation; pulse current; mathematical model; overpotential; electrocrystallization.

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