Convection and Film Instability Copper Anodes in Hydrochloric Acid

Cooper, Ralph S.; Bartlett, James H.

doi:10.1149/1.2428773

Cited by 69 publications

(57 citation statements)

References 6 publications

(10 reference statements)

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“…Considering diffusion Ot:.Ly , this limiting current density can be described by (24) , solution. These types of maxima and minima have been reported previously for iron (10) and for copper (30). In the plateau region , the current density is limited by mass transport of ferrous ion as in HCl solution .…”

Section: Resultssupporting

confidence: 83%

Formation of Salt Films during Passivation of Iron

Beck

1982

J. Electrochem. Soc.

110

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Pure iron in the form of a shielded electrode facing upward was anodically polarized in hydrochloric, perchloric, and sulfuric acid solutions. Ferrous salt films formed in all three electrolytes at potentials and current densities above threshold values determined by mass transport. In perchloric and sulfuric acids, oxide passivation occurred underneath the salt film at potentials above the passivation potential. Analysis of kinetic and transport conditions under and within these salt films indicated that salt films are necessary precursors to oxide passivation in perchloric and sulfuric acid solutions. Oscillatory phenomena during passivation of iron can be explained by formation and dissolution of salt films coupled to pH changes under the salt film due to electrolytic migration.

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Section: Resultssupporting

confidence: 83%

Formation of Salt Films during Passivation of Iron

Beck

1982

J. Electrochem. Soc.

110

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“…Podesta et al 3 have studied the effects of electrolyte convection on oscillations in the iron-sulfuric acid system. C~oper and Bartlett, 4 Landolt et.…”

Section: Introductionmentioning

confidence: 99%

Current Oscillations Observed within the Limiting Current Plateau for Iron in Sulfuric Acid

Russell

Newman

1986

J. Electrochem. Soc.

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The anodic polarization curve for iron rotating-disk electrodes in acidic sulfate electrolytes displays a limiting-current plateau. Sustained current oscillations are observed when the system is potentiostated within a certain potential range on this limiting-current plateau. The frequency of oscillations is found to be proportional to the square root of the diskelectrode rotation speed. Current oscillations are also observed for a hemispherical rotating electrode. The current-time waveform obtained. in.one of these experiments displays a harmonic component giving rise to a "beat" phenomenon. Current-lime waveforms produced by larger disk electrodes {5 mm diameter) rotating at slower speeds (41.7 rad/s) contain a region of high-frequency noise that is present near the position of minimum current in the overall waveform.

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“…As the potential shifts in noble direction the curve develops a gradual change of slope. At about -200 mV Ag/AgCl , this change takes place virtually under the same conditions (Cooper & Bartlett, 1958;Brossard, 1984aBrossard, , 1984bWood et al, 1990;Muñoz-Portero et al, 2005) thus indicating that the dissolution mechanism is changing. The end of the apparent Tafel region is associated with the formation of CuBr (Brossard, 1984b;Valero-Gómez et al, 2006).…”

Section: Discussionmentioning

confidence: 85%