The analysis of electrode impedances complicated by the presence of a constant phase element

Brug, G

doi:10.1016/0368-1874(84)83477-2

Cited by 85 publications

(80 citation statements)

References 8 publications

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“…Q can be converted to C through the Brug approach. 43 The converted C values are also listed in Tables II and III, and will be discussed later. In Table II , suggesting that the former surface can be more completely covered by an electrically insulating layer, whereas the surface layer on the latter may contain more defects in which the carbon fiber bundles can be exposed to the solution in some areas.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

Zhang

Zheng

Song

et al. 2018

J. Electrochem. Soc.

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Carbon fiber reinforced epoxy and nylon were measured by means of potentiodynamic polarization, potentiostatic polarization and AC electrochemical impedance spectroscopy (EIS) in a solution containing 0.9wt% NaCl, 0.1wt% CaCl 2 and 0.075wt% NaHCO 3 . Their microstructures were examined by SEM. The results showed that these two types of carbon fiber reinforced polymers (CFRPs) were electrically conductive and electrochemically noble, and exhibited different EIS characteristics. Strong anodic and cathodic polarization could damage their surface polymer layers. Based on their different microstructures and electrochemical behaviors, a surface polymer layer model was proposed for these CFRPs. and aerospace 16 industries due to its light weight, high stiffness, high strength, good anti-fatigue performance and excellent corrosion resistance. Many investigators have been attracted to pursue better mechanical properties for different types of CFRPs. [17][18][19][20][21] CFRPs are often used together with other engineering metals, such as steels, Al alloys, Mg alloys and Ti alloys in industry. 14,15,22,23 As carbon has an open-circuit-potential (OCP) more positive than most engineering metals, strong galvanic cells can be formed between CFRPs and these metals in aggressive service environments, 24-27 thus galvanic corrosion of the coupled metals has been always a big concern.In the past decades, many studies have been focused on the galvanic effect of CFRPs on the coupled metals, including the influence of metallurgical and environmental factors on the galvanic corrosion. 10,25,[28][29][30][31] These have led to some common knowledge. For example, it has been generally accepted that, apart from the wellknown galvanic corrosion of steels caused by CFRPs, aluminum alloys with good general corrosion resistance, can also suffer from galvanic corrosion if they are coupled with CFRPs. 24,32 The galvanic corrosion of magnesium alloys coupled with CFRPs is more severe than any other engineering metals.26 Titanium alloys are stable in most aggressive environments and not attacked by galvanic corrosion if they are in contact with CFRPs. 27,33 However, most of these studies simply measured or estimated the corrosion damage of metals. They ignored the detailed electrochemical behavior of the coupled CFRPs. 26,32,34 In fact, the metal in contact with a CFRP may deteriorate more severely due to crevices formed in the joint than that simply caused by galvanic effect. On the other hand, the CFRP in a galvanic couple may also degrade and its electrochemical properties may vary with time while the coupled metal is being corroded, as the corrosion products from the coupled metal may in return affect the electrochemical performance or even accelerate the degradation of the CFRP. This kind of possible degradation of a CFRP in a galvanic couple, as well as the detrimental effect of the CFRP degradation on the galvanic corrosion of a coupled metal, has not been systematically investigated.In fact, CFRP can degrade in a corrosive medium chemical...

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Section: Resultsmentioning

confidence: 99%

Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

Zhang

Zheng

Song

et al. 2018

J. Electrochem. Soc.

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“…The samples obtained with 0, 0.025 and 0.1 g/l of the salt were characterized by values of R 2 and R 3 of the same order of magnitude. The capacitance C 1 and C 2 of the two CPE can be calculated using the values of Q and R reported in Table 3 using Eqn (2) [25,26] …”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Corrosion properties of plasma electrolytic oxidation coated AA7075 treated using an electrolyte containing lanthanum‐salts

Pezzato

Brunelli

Dabalà

2016

Surface & Interface Analysis

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Plasma electrolytic oxidation (PEO) is a very promising process that can enhance the corrosion and wear resistance by producing a relatively thick, dense and hard oxide ceramic coating on light alloys. The improvement in the corrosion behaviour of the treated metals strongly depends on some process parameters: current density, voltage, treatment time and electrolyte composition. In particular, the addition of additives in the electrolyte produces significant changes in the corrosion behaviour. The use of rare earth salts, especially of cerium and lanthanum, during PEO treatment was already studied in literature and the use of these salts improved the corrosion resistance of the obtained coatings. However, only few works reported the dissolution of rare earth salts in the electrolyte, whereas in the majority of studies these salts are used in pre-treatment or post-treatment solutions.In this work, the effect of the dissolution in the electrolyte of various concentrations of lanthanum nitrate on the corrosion properties of PEO coated 7075 aluminium alloy was studied. The base electrolyte was an alkaline solution containing sodium silicate and different concentrations of lanthanum nitrate (0.025, 0.05, 0.075 and 0.1 g/l). All the samples were treated with high current densities and for short treatment times. The morphology, thickness and composition of the protective layer were studied with SEM, energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), glow-discharge optical emission spectroscopy and X-ray photoelectron spectroscopy (XPS). The corrosion resistance was evaluated performing potentiodynamic polarization tests and electrochemical impedance spectroscopy tests.PEO coatings obtained with additions between 0.05 and 0.075 g/l of lanthanum nitrate resulted more dense and adherent, as evidenced by SEM analysis. These additions of La(NO 3 ) 3 had a positive effect on the corrosion resistance causing the formation of a large passive zone.

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“…Equivalent electrical circuits are frequently used to extract the parameters associated with the impedance diagrams where a constant phase element (CPE) is used instead of a capacitance to take into account the non-ideal behavior of the interface [17]. The CPE is given by:…”

Section: Electrochemical Impedance Measurementsmentioning

confidence: 99%

Electrochemical Investigation of the Corrosion Behavior of API 5L-X65 Carbon Steel in Carbon Dioxide Medium

Henríquez¹,

Pébère²,

Ochoa³

et al. 2013

Corrosion

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International audienceThe corrosion behavior of API 5L-X65 carbon steel in a carbon dioxide (CO2)-saturated solution was investigated by electrochemical measurements (polarization curves, Levich plots, and electrochemical impedance spectroscopy) with a rotating disk electrode. Different experimental conditions such as hydrodynamics, immersion time, and temperature were considered. From the polarization curves, it was shown that both the anodic and cathodic current densities decreased as the electrode rotation speed, the immersion time, and the temperature increased. This behavior was in agreement with the impedance results obtained at the corrosion potential. It was shown that the corrosion processes were initially controlled by mass transport but they became under activation control for longer immersion times. Scanning electron microscopy was used to characterize the corrosion products. For short immersion times (2 h and 6 h), the corrosion products mainly deposited on the cathodic sites (pearlitic zones) of the carbon steel surface forming a heterogeneous layer, whereas they covered the whole electrode surface after longer periods (>15 h). At a microscale, localized corrosion, as a result of galvanic coupling between pearlite and ferrite, was also observed

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The analysis of electrode impedances complicated by the presence of a constant phase element

Cited by 85 publications

References 8 publications

Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

Effect of the Microstructure of Carbon Fiber Reinforced Polymer on Electrochemical Behavior

Corrosion properties of plasma electrolytic oxidation coated AA7075 treated using an electrolyte containing lanthanum‐salts

Electrochemical Investigation of the Corrosion Behavior of API 5L-X65 Carbon Steel in Carbon Dioxide Medium

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