A comparison of fractal dimensions determined from atomic force microscopy and impedance spectroscopy of anodic oxides on Zr–2.5Nb

McRae, Glenn; Maguire, M.A; Jeffrey, Craig A.; Guzonas, David; Brown, Christopher

doi:10.1016/s0169-4332(02)00165-4

Cited by 43 publications

(16 citation statements)

References 19 publications

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“…As can be seen from EDX diagrams, higher Cr surface concentration was obtained for electropolishing surface of SS 304. The value of fractal dimension (D s ) can be obtained using the average of n values signifying deviation [29] from pure capacitance of a CPE in impedance measurements at different offset potentials according to the following equation [30]:…”

Section: Resultsmentioning

confidence: 99%

Effect of Surface Treatment on Corrosion Resistance of 304 Stainless Steel Implants in Tyrode Solution

Ahmadian¹,

Danaee²,

Golozar³

2014

Archives of Metallurgy and Materials

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The effect of different surface preparation methods such as mechanical, chemical and electrochemical surface preparation on the formation, stability and deterioration of surface films formed on austenitic 304 stainless steel was investigated in Tyrode's physiological solution by cyclic polarization curves, AC impedance measurements surface techniques. A hysteresis loop in a cyclic polarization curve was obtained that indicates a delay in repassivation of an existing pit when the potential is scanned cathodically. Electrolytic polishing and ultrasonic cleaning improves corrosion resistance by increasing the value of the corrosion potential and breakdown potential of the passive layer as well as the pit initiation potential. After mechanical polishing no perfect passivation region was observed. Change in surface fractal is in good agreement with the result obtained from height roughness factor of AFM.Keywords: Electrolytic polishing, Chemical passivation, 304 Stainless steel, AFM Wpływ różnych sposobów przygotowania powierzchni, takich jak mechaniczne, chemiczne i elektrochemiczne na tworzenie, stabilność i degradację warstw powierzchniowych utworzonych na austenitycznej stali nierdzewnej 304, badano w fizjologicznym płynie Tyrode'a technikami badań powierzchni -cyklicznych krzywych polaryzacyjnych oraz impedancji. Uzyskano pętlę histerezy cyklicznej krzywej polaryzacyjnej, co wskazuje na opóźnienie w repasywacji istniejących wżerów podczas skanowania potencjału w kierunku katodowym. Elektrolityczne polerowanie i czyszczenie ultradźwiękowe poprawia odporność korozyjną poprzez zwiększenie potencjału korozyjnego i potencjału przebicia warstwy pasywnej, jak również potencjału tworzenia się wżerów. Zmiana fraktala powierzchni jest w dobrej zgodności z wynikami uzyskanymi dla wysokościowych współczynników chropowatości z pomiarów AFM.

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Section: Resultsmentioning

confidence: 99%

Effect of Surface Treatment on Corrosion Resistance of 304 Stainless Steel Implants in Tyrode Solution

Ahmadian¹,

Danaee²,

Golozar³

2014

Archives of Metallurgy and Materials

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“…Equation (5) is significant because it converts the awkward units of F 1-n of the generalized fitted capacitance in units to F, thus C eff is referred to as effective capacitance [3]. The validity fractional distribution has been substantiated by comparing surface fractal dimension using Atomic Force Microscopy with fd using EIS [4].…”

Section: Methodsmentioning

confidence: 99%

“…Ten fit parameters: three for each response and a low frequency resistance are necessary and sufficient to fit the data [3,4].…”

Section: Introductionmentioning

confidence: 99%

Using EIS/PEDRA to Describe Barrier Oxide Films on Irradiated Zirconium Alloys

Maguire¹

2014

MRS Proc.

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Electrochemical Impedance Spectroscopy (EIS) and the Parallel Electrical Dielectric Response Analysis (PEDRA) application were used to describe the inner barrier oxide films on irradiated zirconium alloys. This is achieved with minimal surface preparation and without disturbing the outer porous oxide. These two distinguishable inner and outer oxide layers result from a growthfracture oxidation mechanism. Key to success of the EIS technique in describing the barrier oxide layer are: 1) the model and procedure used to fit EIS spectra, 2) the validation of the fit, and 3) converting circuit parameters (R, C and n) into physical attributes of the barrier oxide.The barrier oxide is defined as the inner-dense layer adjacent to the metal-oxide interface. The integrity of barrier oxide is thought to effect both oxidation (i.e. access of water to the interface), and hydrogen pickup (i.e. failure hydrogen to escape away from the interface). Using EIS and the PEDRA application, the barrier oxide is described in terms of multiple independent dielectric responses to yield a unique 'micro-macro' picture of the barrier oxide that can be used to explain observed H pickup behavior.

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“…Determination of the fractal dimension of the electrode surface is a common way to characterize the electrodes regarding their surface roughness (Le Mehaute and Crepy 1983;Hernandez-Creus et al 1993;Liu 1985;Nyikos and Pajkossy 1985;Kaplan, Grey, and Liu 1987;McRae et al 2002;Eftekhari 2003). In general, fractal dimension, D f , is a quantity which relates a specific feature of the object to the observation scale:…”

Section: Fractal Dimension Of Cicf-solution Interfacementioning

confidence: 99%

Two- and Three-Dimensional Fractal Dimensions of Electro-Deposited Carbon-Black-Epoxy Composite Films

Ranjbar

Rastegar

2009

Analytical Letters

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Conductor-insulator composite films were prepared by cathodic electro-deposition of a dispersion of conductive carbon black and epoxy resin onto tricationic-phosphated galvanized steel panels. The prepared composite films were then characterized regarding their surface and bulk fractality using the electrochemical impedance spectroscopy. A novel method was offered for the first time to determine the fractal dimension of the conductive paths in the bulk of the films. It was found that increasing the carbon black content from 2 to 8 percent causes the fractal dimension of the electro-active region at the film-solution interface (2D-fractal dimension) to increase from 1.47 to 2.61 while it results in a decrease of the fractal dimension of the conductive paths inside the composite films (3D-fractal dimension) from 2.6 to 2.27.

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A comparison of fractal dimensions determined from atomic force microscopy and impedance spectroscopy of anodic oxides on Zr–2.5Nb

Cited by 43 publications

References 19 publications

Effect of Surface Treatment on Corrosion Resistance of 304 Stainless Steel Implants in Tyrode Solution

Effect of Surface Treatment on Corrosion Resistance of 304 Stainless Steel Implants in Tyrode Solution

Using EIS/PEDRA to Describe Barrier Oxide Films on Irradiated Zirconium Alloys

Two- and Three-Dimensional Fractal Dimensions of Electro-Deposited Carbon-Black-Epoxy Composite Films

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