Anodic electrocrystallization

Fleischmann, M.; Thirsk, H. R.

doi:10.1016/0013-4686(60)87005-3

Cited by 117 publications

(57 citation statements)

References 11 publications

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“…Consequently, the two previous theoretical cases do not allow to explain the typical appearance of the experimental curves during the anodizing, specially the initial peak after galvanostatic polarisation (Figure 2). By analogy, these typical "bell shaped" curves should be in fact very similar to the chronopotentiograms obtained during the nucleation phenomena in metal electrodeposition [17,18]. In that case, the initial potential increase is linked to the double-layer charge, while the decrease should be typical of a nucleation phenomenon.…”

Section: Theoretical Considerationssupporting

confidence: 60%

Simulation of the electrical transient during the porous anodizing of pure aluminium substrate

Coz¹,

Arurault²,

Bès³

2007

WIT Transactions on Engineering Sciences, Vol 54

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Electrical transients were recorded during the anodizing of highly pure aluminium in phosphoric electrolyte, carried out in potentiostatic mode (25-150V) or in galvanostatic conditions (20-1000A/m 2 ). The experimental reproductibility is satisfactory, according to the low standard deviations.For the galvanostatic mode, the voltage experimental transients show a "bell shape", characterized by some significant parameters (S 0 , t m , V m , V ss ). Two mathematical relations were then proposed to simulate the voltage transient curves considering two parts, i.e. before and after the maximum (V m , t m ). The validity of these computational simulations was next checked by comparison with the corresponding experimental curves. All the corresponding fittings of voltage transients are in good agreement, especially for the first part of the experimental curves, within the current densities range.Then, these computational simulations were correlated with the corresponding experimental FEG-SEM plan-views. By analogy with the nucleation phenomena during the metal electrodeposition, the "bell shaped" curves could be interpreted by the initial formation of a highly resistive oxide layer, followed by the subsequent appearance of the nanopores. The pores formation was in part explained showing that the V m experimental values obtained with the galvanostatic mode are closed to the previous critical voltage value U c initializing the anodic dissolution phenomenon.

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Section: Theoretical Considerationssupporting

confidence: 60%

Simulation of the electrical transient during the porous anodizing of pure aluminium substrate

Coz¹,

Arurault²,

Bès³

2007

WIT Transactions on Engineering Sciences, Vol 54

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“…[32][33][34][35] These studies led to the concepts of the nucleation of nanocentres of the new phase as the initial step, instantaneous and progressive nucleation, two and three dimensional growth, overlap of growing centres, thickening under electron or mass transfer control. 36 These studies of the early stages of electrochemical phase formation have been extended using other experimental techniques and to other solutions and substrates by several groups.…”

Section: Deposition Of Lead Dioxide 31 Nucleation and Early Growthmentioning

confidence: 99%

Electrodeposited lead dioxide coatings

2011

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Lead dioxide coatings on inert substrates such as titanium and carbon now offer new opportunities for a material known for 150 years. It is now recognised that electrodeposition allows the preparation of stable coatings with different phase structures and a wide range of surface morphologies. In addition, substantial modification to the physical properties and catalytic activities of the coatings are possible through doping and the fabrication of nanostructured deposits or composites. In addition to applications as a cheap anode material in electrochemical technology, lead dioxide coatings provide unique possibilities for probing the dependence of catalytic activity on layer composition and structure (critical review, 256 references).

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“…It appears that UPD brings about changes in the interfacial energy term governing the rate of the nucleation process [73,108], large enough to make it a predominant factor of influence on the nucleation overpotential. This would lead to higher nucleation rates at very low negative overpotentials observed in this work as well as by some other authors [105][106][107].…”

Section: Interdependence Of Under and Overpotential Depositionsmentioning

confidence: 99%