Untitled

González, José Antonio Varela; López, V.; Bautista, A.; Otero, E.; Nóvoa, X.R.

doi:10.1023/a:1003481418291

Cited by 118 publications

(67 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…R p and R b are the resistances of the porous and barrier layer, C p and C b the associated capacitances, and R sol the electrolyte resistance which include the corresponding resistance of the solution that fills the opened pores of the unsealed coatings. The authors, with a more complex EC [13] have demonstrated a very satisfactory agreement between experimental and fitted values.…”

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 67%

“…Impedance diagrams were recorded for the sealed and unsealed anodised specimens, immediately after anodising and sealing and after different ageing times. A surface area of 1 cm 2 was exposed to the impedance test solution, applying a 10 mV amplitude sine wave and a frequency range from 1 mHz to 100 kHz, using the same equipment and test cell as previously reported [13,15]. Fig.…”

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 99%

“…It can be seen that over a wide frequency range the impedance of the sealed and unsealed anodic films differs by 2-3 orders of magnitude, making EIS a very sensitive tool to discern sealing quality or to detect changes in the characteristics of the barrier and porous layers. This figure also shows in schematic form how the capacitance of the barrier and porous layers, C b and C p , can be estimated by extrapolation of the straight line regions to the angular frequency ω = 1, and how the porous layer resistance, R p , can be estimated from the impedance value corresponding to the minimum phase angle θ [13]. Different equivalent circuits have been proposed to simulate the behaviour of anodised aluminium [13,[29][30][31].…”

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 99%

“…This figure also shows in schematic form how the capacitance of the barrier and porous layers, C b and C p , can be estimated by extrapolation of the straight line regions to the angular frequency ω = 1, and how the porous layer resistance, R p , can be estimated from the impedance value corresponding to the minimum phase angle θ [13]. Different equivalent circuits have been proposed to simulate the behaviour of anodised aluminium [13,[29][30][31]. The very simple circuits initially proposed by Hitzing and Juttner for sealed and unsealed anodic films and reproduced in Fig.…”

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 99%

See 3 more Smart Citations

Behaviour of different bare and anodised aluminium alloys in the atmosphere

Bartolomé

Río²,

Escudero

et al. 2008

Surface and Coatings Technology

Self Cite

View full text Add to dashboard Cite

Exposure tests in natural atmospheres are an indispensable means for determining the behaviour and durability of metallic materials in the atmosphere. The corrosion behaviour of bare aluminium and anodised aluminium with three different coating thicknesses has been evaluated for two years' exposure in two natural atmospheres of very different corrosivities: one urban and the other marine. Several techniques have been used to evaluate changes in the specimens during exposure, but special attention is paid to the direct measurement of corrosion by gravimetry and its indirect estimation by the comparatively much more sensitive electrochemical impedance spectroscopy (EIS) technique. The results show that if no demands are placed on the conservation of its appearance, aluminium may be used without protection even in atmospheres of medium or high corrosivity. The anodising and sealing of aluminium alloys, above an ill-defined minimum thickness threshold, is an appropriate solution to prevent localised corrosion of aluminium and to conserve its appearance, even in aggressive atmospheres.

show abstract

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 67%

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 99%

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 99%

Section: Characterisation Of Anodic Layers By Eismentioning

confidence: 99%

See 2 more Smart Citations

Behaviour of different bare and anodised aluminium alloys in the atmosphere

Bartolomé

Río²,

Escudero

et al. 2008

Surface and Coatings Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…The values of capacitance (C p , C b ) and resistance (R p ) of the porous (p) and barrier (b) layers are summarized in Table 1. These values for the sealed oxide ®lm are of the order lF/cm 2 , nF/cm 2 and 10 5 X cm 2 respectively, which indicates adequate sealing quality of the oxide ®lm [12]. The increase in C p and decrease in R p values observed with t corr can be attributed to the dissolution of the porous layer.…”

Section: Resultsmentioning

confidence: 81%

Corrosion behaviour of solar reflector coatings on AA 2024T3 – an electrochemical impedance spectroscopy study

et al. 2002

View full text Add to dashboard Cite

Electrochemical impedance spectroscopy in the 100 kHz±5 mHz frequency range was applied to the study of corrosion behaviour of solar re¯ector coatings on AA 2024 exposed to 3.5% NaCl solution. Solar re¯ector coatings were obtained by sulphuric acid anodization of the alloy in presence of oxo-anions of molybdenum or vanadium. Corrosion behaviour of the oxide ®lms was evaluated by determining the ®lm resistance and capacitance values with exposure time. Comparison of the results reveals that, vanadium addition confers better barrier properties and corrosion resistance than molybdenum additions. Analysis using damage function based on the impedance at 100 mHz shows that solar re¯ector coatings have improved corrosion behaviour than normal sulfuric acid anodized oxide ®lms on AA 2024. Ó

show abstract

Evaluation of different sealing methods for anodized aluminum‐silicon carbide (Al/SiC) composites using EIS and SEM techniques

Herrera-Hernández

Vargas-Garcı́a

Hallen-López

et al. 2007

Materials & Corrosion

View full text Add to dashboard Cite

Electrochemical impedance spectroscopy (EIS) and the scanning electron microscope (SEM) have been used in an investigation of the effectiveness of various sealing methods that can be used to improve the corrosion resistance of an anodized aluminum-silicon carbide (Al/SiC) composite. Anodic oxide films were grown on Al7075-T6 and the Al/SiC composite by sulfuric acid anodizing and sealing in a cold saturated solution of nickel acetate. Other samples were sealed using the traditional method of boiling water or hot nickel acetate for comparison. The results revealed a uniform anodized layer on Al7075-T6 that resisted pitting corrosion for more than 2 weeks exposure to NaCl, whereas a cracked oxide film with variations in thickness was observed on the composite material. Pit initiation occurred in less than 5 days on the anodized Al/SiC that was sealed in the hot solutions. This study suggests that the traditional hot sealing methods did not provide sufficient corrosion protection for aluminum metal-matrix composites (MMCs) because the reinforcing SiC particles deteriorated the surface film structure. However, this defective film can be repaired by nickel hydrate precipitation during cold sealing or by applying a thick polyurethane coating.

show abstract

Untitled

Cited by 118 publications

References 9 publications

Behaviour of different bare and anodised aluminium alloys in the atmosphere

Behaviour of different bare and anodised aluminium alloys in the atmosphere

Corrosion behaviour of solar reflector coatings on AA 2024T3 – an electrochemical impedance spectroscopy study

Evaluation of different sealing methods for anodized aluminum‐silicon carbide (Al/SiC) composites using EIS and SEM techniques

Contact Info

Product

Resources

About