Electrochemical Impedance Spectroscopy and Electron Microscopies Applied to the Structure of Anodic Oxide Layers on Pure Aluminium

Baltat-Bazia, A.; Celati, N.; Keddam, M.; Takenouti, H.; Wiart, R.

doi:10.4028/www.scientific.net/msf.111-112.359

Cited by 17 publications

(9 citation statements)

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“…On the other hand, circuit B was developed to represent a sealed anodic oxide film [30]. That is, the model represented by circuit A has been modified to take in account the precipitation of some hydrates/ precipitates inside the surface porous film, thus hindering the penetration of the electrolyte to the metal substrate through the pores of the surface films.…”

Section: Article In Pressmentioning

confidence: 99%

Degradation characteristics of hydroxyapatite coatings on orthopaedic TiAlV in simulated physiological media investigated by electrochemical impedance spectroscopy

2003

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This paper concentrates on the degradation characteristics of hydroxyapatite (HA) coatings on orthopaedic Ti-6Al-4V alloy while immersed in Ringer's salt solution, which were investigated by electrochemical impedance spectroscopy. Electrochemical impedance spectroscopy measurements were used to in situ characterize the electrochemical behavior of the passivated alloy covered with HA during aging in Ringer's solution. Comparison of the electrochemical data for the coated material with that for the uncoated metal substrate was also performed. The characteristic feature that describes the electrochemical behavior of the coated material is the coexistence of large areas of the coating itself with pores where the substrate is exposed to the aggressive media. The interpretation of results was thus performed in terms of a two-layer model of the film, in which the precipitation of hydrated oxide or phosphate compounds seals the pores left by the ceramic coating. The blocking effect due to salt precipitation inside the pores produces an enhancement of the resistance values, thus effectively diminishing the metal ion release in the system.

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Section: Article In Pressmentioning

confidence: 99%

Degradation characteristics of hydroxyapatite coatings on orthopaedic TiAlV in simulated physiological media investigated by electrochemical impedance spectroscopy

2003

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“…In this case, the pores in the outer part of the oxide film are filled by some precipitate, as judged from the capacitance and resistance values found by EIS. 30,33,41 For abraded samples exhibiting this type of spectra, the capacitance of the outer layer was around 2 F/ cm 2 whereas for H 2 O 2 -treated samples after the cell culture the capacitance of the outer layer was around 5 F/cm 2 . Since the oxide film is thicker on H 2 O 2 -treated samples than on abraded ones before the cell culture, 35 these capacitance data indicate that the oxide surface after the cell culture is rougher on H 2 O 2 -treated samples than on abraded samples.…”

Section: Eis Characterizationmentioning

confidence: 99%

Variation of oxide films on titanium induced by osteoblast-like cell culture and the influence of an H2O2 pretreatment

Pan

Liao

Leygraf

et al. 1998

J. Biomed. Mater. Res.

163

130

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Variations of titanium oxide films induced by osteoblast-like cells in a rat calvaria culture system and the influence of an H2O2 pretreatment have been investigated by using X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy. For abraded titanium, the results revealed that phosphate and calcium ions may incorporate into the surface oxide film during the cell culture, forming a precipitate with a Ca/P ratio near that of hydroxyapatite. Oxidized carbon also was found in the surface layer, most likely precipitated hydroxylcarbonated apatite (HCA). The H2O2 pretreatment of titanium in a phosphate-buffered saline solution results in a 10-fold thickened porous oxide film and large amounts of surface hydroxyl groups as well as a certain amount of phosphate ions inside the oxide film. During the cell culture, the H2O2-treated titanium surface favors the ion incorporation and precipitation of the HCA-like compound, which probably is inlaid into the oxide film. Osteoblast-like cells on the H2O2-treated titanium showed a more active morphology during the initial stage compared with cells on abraded titanium. Moreover, bone-like nodule formation and mineralization appear to be related to the precipitation of the HCA-like compound on the surface. The results are discussed with respect to corrosion resistance, ion incorporation and precipitation of the HCA-like compound on the surface, osseointegration, and bioactivity of titanium implants.

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“…This indicates thickening of the outer layer and the film retains its protective ability. In some literature, it has been reported that the increase in film resistance and the decrease in film capacitance with time indicate the growth and formation of compact passive film [29,30]. As the surface film grows, different transport mechanisms take place in the inner and outer parts of the film.…”

Section: Effect Of Exposure Timementioning

confidence: 99%

Investigation of Passive Film Properties and Pitting Resistance of AISI 316 in Aqueous Ethanoic Acid Containing Chloride Ions using Electrochemical Impedance Spectroscopy(EIS)

Mahato

Singh

2011

Port. Electrochim. Acta

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The structure and properties of the passive film formed on the surface of AISI 316 stainless steel in aqueous ethanoic acid have been investigated using EIS. Experiments were carried out at 30 ºC in different concentrations of ethanoic acid. Effects on the film properties due to the change of electrode potential, exposure durations and addition of chloride ions to the electrolyte were also studied. Impedance parameters were determined using simple model and equivalent electrical circuit. Results suggest the formation of multilayered passive film on the steel surface. The film possessed dual structure. Inner layers were thin and compact, whereas the outer layer was porous and defective. The measured capacitive behavior was of non ideal nature and hence replaced by constant phase element or CPE. Formation of the passive film and the change in its structure has been explained using impedance parameters.

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Electrochemical Impedance Spectroscopy and Electron Microscopies Applied to the Structure of Anodic Oxide Layers on Pure Aluminium

Cited by 17 publications

References 0 publications

Degradation characteristics of hydroxyapatite coatings on orthopaedic TiAlV in simulated physiological media investigated by electrochemical impedance spectroscopy

Degradation characteristics of hydroxyapatite coatings on orthopaedic TiAlV in simulated physiological media investigated by electrochemical impedance spectroscopy

Variation of oxide films on titanium induced by osteoblast-like cell culture and the influence of an H2O2 pretreatment

Investigation of Passive Film Properties and Pitting Resistance of AISI 316 in Aqueous Ethanoic Acid Containing Chloride Ions using Electrochemical Impedance Spectroscopy(EIS)

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