EIS characterization of thick flawed organic coatings aged under cathodic protection in seawater

Thu, Quy Le; Takenouti, H.; Touzain, S.

doi:10.1016/j.electacta.2005.07.049

Cited by 57 publications

(21 citation statements)

References 17 publications

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“…In most of the cases, a circuit including diffusion impedance through a layer of finite thickness [2] gave the best agreement between experimental and calculated curves. This circuit describes a degraded coating with a weak charge transfer [34].…”

Section: Equivalent Circuit For the Eis Simulationmentioning

confidence: 99%

The Corrosion Protection Behaviour of Zinc Rich Epoxy Paint in 3% NaCl Solution

Hammouda¹,

Chadli²,

Guillemot³

et al. 2011

ACES

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Electrochemical impedance spectroscopy (EIS) in the l00 kHz-10 mHz frequency range was employed as the main electrochemical technique to study the corrosion protection behaviour of zinc rich epoxy paint in 3% NaCl solution. The EIS results obtained at the open-circuit corrosion potential have been interpreted using a model involving the impedance of particle to particle contact to account for the increasing resistance between zinc particles with immersion period, in addition to the impedance due to the zinc surface oxide layer and the electrical resistivity of the binder. Galvanic current and dc potential measurements allowed us to conclude that the cathodic protection effect of the paint takes some time to be achieved. The loss of cathodic protection is due to a double effect: the decrease of the Zn/Fe area ratio due to Zn corrosion and the loss of electric contact between Zn to Zn particles. Even when the cathodic protection effect by Zn dust become weak, the substrate steel is still protected against corrosion due to the barrier nature of the ZRP film reinforced by Zn

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Section: Equivalent Circuit For the Eis Simulationmentioning

confidence: 99%

The Corrosion Protection Behaviour of Zinc Rich Epoxy Paint in 3% NaCl Solution

Hammouda¹,

Chadli²,

Guillemot³

et al. 2011

ACES

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show abstract

“…In this equivalent circuit model, R S is the solution (electrolyte) resistance, R C is the coating pore resistance (generally interpreted as a consequence of the electrolyte penetration), and R ct is the charge-transfer resistance. A constant phase element (CPE) represents the charge accumulation at the electrolyte/polymer interface, which is affected by the decreased conductivity of the electrolyte and is classically interpreted as the electric double layer capacitance, C DL . W is the Warburg diffusional impedance and C μ̅ is the electrochemical capacitance, classically presented as the electrostatically coating capacitance, C C = ϵϵ 0 A / d , and reinterpreted as the electrochemical DOS occupancy variations.…”

Section: Resultsmentioning

confidence: 99%

Impedimetric and Capacitive Transducer Platform for Chemical Sensors Based on Electrodeposited Polyaniline Thin Films

Mello

Mulato

2022

J. Phys. Chem. C

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Analytical sensors for rapid and faithful responses allowing for miniaturization have increased in relevance. Electrochemical methods are fulfilling such requirements through multiplexable and effective detection. An electrochemical pH sensor based on galvanostatically electrodeposited polyaniline (PANI) thin films is here presented. Electrochemical impedance spectroscopy (EIS) and capacitance spectroscopy (ECS) are analyzed as transduction stages. The capacitive properties of PANI applied in chemical sensors are novel. Sensitivity, linearity, and hysteresis were studied for both electrochemical settings. The impedimetric/capacitive electrochemical setup provides information about the polymeric samples' conductivity, impedance, double layer properties, and electrochemical capacitance. The oxidation state of the PANI layer directly influences its response in each sensor setup through the protonation potential and electronic density of the PANI samples. PANI thin films produced with a deposition current density of 0.5 mA/cm 2 presented the largest sensitivity for the impedimetric setup (12.7 ± 2.2% per pH and linearity of 91.7%) while the PANI thin films produced at 1.0 mA/cm 2 presented the largest sensitivity for the capacitive setup (15.3 ± 1.7% per pH and linearity of 94.1%). Development of distinct electrochemical sensor platforms with the same material is possible by controlling the oxidation state of the samples. The sensor is suitable to be used in many different applications such as environmental, food, and health biosensors based on chemical measurement.

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“…The most commonly used techniques to prevent external corrosion in seawater are organic coatings and cathodic protection, whether by galvanic or impressed current 5. However, since painting systems commonly used as anticorrosive coatings tend to fail under prolonged marine exposition, the combination of both techniques is a common practice, increasing the material lifetime 6, 7. While painting systems create a barrier against electrolyte diffusion, preventing electrochemical reactions, cathodic protection is based on the cathodic polarization of metallic materials, shifting potentials to values where metal species are thermodynamically stable (immunity region).…”

Section: Introductionmentioning

confidence: 99%

Calcareous Deposits Formed Under Long‐Term In Situ Cathodic Protection Tests

2021

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The calcareous deposits formed under commonly applied cathodic protection techniques on coated and uncoated carbon steel samples immersed in Guanabara Bay for 150 days, simulating ships and pipelines, were investigated. Potentials were monitored throughout the analysis, and deposits were examined by visual inspection, optical microscopy, energy‐dispersive X‐ray spectroscopy, and X‐ray diffraction. Beyond calcite, aragonite, and brucite, which are crystals commonly reported in laboratory tests or under confined space conditions, herein, also calcite‐II and calcite‐III were identified as intermediate crystalline structures. Furthermore, it was demonstrated that biological activity also plays an important role, forming calcareous tubular structures within the deposit.

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EIS characterization of thick flawed organic coatings aged under cathodic protection in seawater

Cited by 57 publications

References 17 publications

The Corrosion Protection Behaviour of Zinc Rich Epoxy Paint in 3% NaCl Solution

The Corrosion Protection Behaviour of Zinc Rich Epoxy Paint in 3% NaCl Solution

Impedimetric and Capacitive Transducer Platform for Chemical Sensors Based on Electrodeposited Polyaniline Thin Films

Calcareous Deposits Formed Under Long‐Term In Situ Cathodic Protection Tests

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