Using EIS to study the electrochemical response of alloy AA5083 in solutions of NaCl

Aballe, A.; Bethencourt, M.; Botana, Francisco; Osuna, R.; Marcos, M.

doi:10.1002/1521-4176(200103)52:3<185::aid-maco185>3.0.co;2-o

Cited by 25 publications

(13 citation statements)

References 5 publications

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“…Thus, the response corresponding to the intermetallics is also minimized, with the loop R int -C int disappearing. In accordance with [22,25] this response is demonstrated in the zones of the spectrum corresponding to the highest frequencies. 7(b).…”

Section: Assessment Of the Effectiveness Of The Protectionsupporting

confidence: 79%

“…1 shows the evolution over time of the OCP of a sample of alloy AA5083 in an aerated solution of NaCl at 3.5% [15,22]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…3 are shown the SEM images corresponding to each of these samples. As can be observed, the treated samples present a branch with a steeper slope than that obtained for the untreated samples, which means that in these samples the layer of oxide has not reached the thickness necessary for the stabilization potential to be reached [15,22,25]. Also included in Fig.…”

Section: Immersion Treatmentsmentioning

confidence: 93%

“…On the other hand, in accordance with the analyses made in [14,15,22], the reduction in the effective cathodic area should bring with it a decrease of the oscillations in the pseudo-stationary branch of the E corr -t diagram. This latter finding could be explained by the cerium coating not having had sufficient time to cover all the cathodic precipitates of the alloy in 24 hours, leaving some cathodic zones still active.…”

Section: Immersion Treatmentsmentioning

confidence: 99%

“…In this case, the electrochemical response of the system is modeled by means of a circuit such as that in Fig. For this reason, in order to perform the electrochemical characterization of the mixed layer, only the zone of the spectrum between 10 kHz and 1 Hz needs to be analyzed [22,25]. In line with the comments previously made, this circuit can be employed to simulate the electrochemical response in a solution of NaCl, of the samples treated by immersion in the solution of CeCl 3 .…”

Section: Assessment Of the Effectiveness Of The Protectionmentioning

confidence: 99%

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On the mixed nature of cerium conversion coatings

Aballe

Bethencourt

Botana

et al. 2002

Materials and Corrosion

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Alternative pretreatments are currently under development in order to avoid the environmental impact produced by using surface finishing processes based on chromates. Some of the environmentally friendly alternatives proposed involve the use of lanthanide based compounds. In this study, conversion coatings on AA5083 (Al‐Mg) samples developed using full immersion pretreatments in 500 ppm CeCl3 aqueous solutions have been investigated. Their microscopic and compositional features have been analyzed using SEM images and EDS spectra. From this analysis it has been determined that this layer over the surface of the samples is of a heterogeneous composition. This coating is formed by an alumina coating covering the aluminum matrix and dispersed cerium‐rich islands deposited over the cathodic sites of the alloy. A characterization methodology is proposed based on the utilization of different electrochemical techniques, such as Open Circuit Potential monitoring (OCP), Linear Polarization (LP) and Electrochemical Impedance Spectroscopy (EIS).

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Section: Assessment Of the Effectiveness Of The Protectionsupporting

confidence: 79%

“…1 shows the evolution over time of the OCP of a sample of alloy AA5083 in an aerated solution of NaCl at 3.5% [15,22]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Immersion Treatmentsmentioning

confidence: 93%

Section: Immersion Treatmentsmentioning

confidence: 99%

Section: Assessment Of the Effectiveness Of The Protectionmentioning

confidence: 99%

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On the mixed nature of cerium conversion coatings

Aballe

Bethencourt

Botana

et al. 2002

Materials and Corrosion

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Combination of thermal activation and addition of H₂O₂ to improve cerium‐based immersion treatment of alloy AA5083

Bethencourt

Botana²,

Cano

et al. 2003

Materials & Corrosion

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Intensive research has been undertaken in recent years aimed at finding non-contaminating alternatives to surface treatment processes based on the use of chromates. One of the alternatives proposed involves the use of lanthanide salts, and a variety of methods of protection have been described. In this study, the results of the treatment of samples of alloy AA5083 in a solution of Ce(III) at 323 K and incorporating small quantities of oxygenated water are presented. These results indicate that the application of this type of treatment gives a considerable reduction in the time required for this process and high levels of protection. This time reduction is associated with a combined effect caused, in part by the presence of oxygenated water, which facilitates the formation of islands of cerium, and in part by thermal activation, which facilitates a more rapid development of the alumina film over the metal matrix. Lastly, the results obtained indicate that these treatments provide increased resistance of the alloy against pitting corrosion.

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EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution

Guo-sheng

Chen

Fang

et al. 2010

Materials & Corrosion

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The pitting corrosion behavior of 7150 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS) in the sodium chloride and hydrochloric acid solution. Based on EIS features and corrosion morphologies as well as corrosion potential, the process of pitting corrosion could be clearly divided into four stages: at the first stage, the Nyquist diagram was composed of two overlapping capacitive loops at the high-medial frequency and one inductive loop at the low frequency. At the second stage (metastable pits developing stage), there existed one small capacitive loop at the high frequency and one big capacitive loop at the medial frequency. At the third stage (stable pits developing stage), two time constants were more clearly distinguished, corresponding to two obvious capacitive loops. At the fourth stage, there appeared one capacitive loop, attributing to uniform corrosion. An equivalent circuit was designed to fit EIS, and the experimental results and the fitted results had good correspondence.

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Using EIS to study the electrochemical response of alloy AA5083 in solutions of NaCl

Cited by 25 publications

References 5 publications

On the mixed nature of cerium conversion coatings

On the mixed nature of cerium conversion coatings

Combination of thermal activation and addition of H₂O₂ to improve cerium‐based immersion treatment of alloy AA5083

EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution

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Using EIS to study the electrochemical response of alloy AA5083 in solutions of NaCl

Cited by 25 publications

References 5 publications

On the mixed nature of cerium conversion coatings

On the mixed nature of cerium conversion coatings

Combination of thermal activation and addition of H2O2 to improve cerium‐based immersion treatment of alloy AA5083

EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution

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Combination of thermal activation and addition of H₂O₂ to improve cerium‐based immersion treatment of alloy AA5083