Electrochemical impedance spectroscopy as a tool to obtain mechanistic information on the passive behaviour of aluminium

Wit, J.H.W. de; Lenderink, H.J.W.

doi:10.1016/0013-4686(95)00462-9

Cited by 122 publications

(57 citation statements)

References 18 publications

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“…All the diagrams are composed by a depressed capacitive loop, which for aluminum alloys has been ascribed to a series connection of the capacitance of the thin oxide layer present on the metal surface and the double layer capacity in parallel with a charge transfer resistance. [47][48][49] However, for the AA2024 after 8 h of immersion, a second-time constant appears which can be attributed to a diffusion process associated with the oxygen reduction reaction on the IMPs. For the FSW sample, the impedance is always one order of magnitude lower than for the two other samples.…”

Section: Resultsmentioning

confidence: 99%

Multiscale Electrochemical Study of Welded Al Alloys Joined by Friction Stir Welding

Abreu

Costa

Melo

et al. 2017

J. Electrochem. Soc.

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Section: Resultsmentioning

confidence: 99%

Multiscale Electrochemical Study of Welded Al Alloys Joined by Friction Stir Welding

Abreu

Costa

Melo

et al. 2017

J. Electrochem. Soc.

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“…After adding fenugreek, the shape is not changed throughout a series of inhibitor´s concentrations, indicating that there is almost no change in the corrosion mechanism due to the inhibitor addition. According to Mansfeld et al [30], Bessone et al [31], Wit and Lenderink [32], and Brett [33], the capacitive loop at HF could be assigned to the formation of an oxide layer on Al. In the experiments, it is reasonable to assume that the electrode surface has been covered with an oxide layer, because of the ex situ pretreatment of the electrode.…”

Section: Resultsmentioning

confidence: 99%

“…In the presence of the inhibitor, the complex of [metaloxide-hydroxide-inhibitor]ads could also be formed [35]. The fact that all these processes are represented by only one loop could be attributed either to the overlapping of the loops of processes, or to the assumption that one process dominates and, therefore, excludes the other processes [32]. On the other hand, the cause of the inductive loop at low frequency is still uncertain.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

Ennouri¹,

Lamiri²,

Essahli³

2017

Port. Electrochim. Acta

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The corrosion inhibition of aluminum by the extract of Trigonellafoenum-graecum L was studied in a hydrochloric acid 1 M solution using electrochemical polarization measurements and electrochemical impedance spectroscopy (EIS). Three organic solvents, pentane, dichloromethane (DCM) and ethanol, of different polarities, were tested. An inhibition efficiency of 86.6 %, 84.41 %, and 75.77 % was obtained by the addition of 1400 ppm of the extract using three solvents: DCM, ethanol and pentane, respectively. The potentiodynamic curves show that the decrease of aluminum corrosion in the presence of the fenugreek extract in a HCl 1 M solution mainly acts by a mixed process with an anodic tendency for both extracts with ethanol and with pentane; on the other hand, the extract with DCM showed a cathodic tendency. The temperature effect on the corrosion of aluminum indicates that the inhibition efficiency of the natural substance decreases with an increase in temperature. The inhibition efficiency values obtained from the polarization curves are in good agreement with those of EIS.

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“…La espectroscopia de impedancia electroquímica (EIS) ha sido utilizada para estudiar el comportamiento de películas pasivas formadas sobre aluminio puro en medios de distinta agresividad (9)(10)(11)(12). A partir de la respuesta electroquímica obtenida, en estos trabajos se establece el intervalo de potenciales en el que dichas películas son estables, así como los valores del potencial a partir de los cuales empieza a predominar el proceso de formación de picaduras.…”

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Estudio mediante EIS de la respuesta electroquímica de la aleación AA5083 frente a señales DC anódicas

Aballe¹,

Bethencourt²,

Botana³

et al. 1998

REVMETAL

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Resumen Se ha llevado a cabo un estudio, mediante Espectroscopia de Impedancia Electroquímica (EIS), del comportamiento de la aleación AA5083 polarizada anódicamente en disolución de NaCl al 3,5 %. Los espectros de impedancia se registraron a distintos potenciales DC, seleccionados de acuerdo con el intervalo de pasividad que aparece en su curva de polarización anódica. En el rango de potenciales estudiado, se han obtenido tres tipos de respuesta electroquímica, cada una con un diagrama de Nyquist característico. Los diagramas obtenidos se han simulado construyendo los correspondientes circuitos equivalentes. La evolución, con la polarización aplicada, de los valores de los elementos que componen cada circuito ha permitido definir el intervalo de potencial en el que la capa pasiva es estable, se forman picaduras metaestables, o se nuclean y crecen picaduras. Por último, se propone utilizar "superficies de Bode" para visualizar globalmente la evolución del sistema con la polarización aplicada.Palabras Clave: EIS. AA5083. Rama anódica. Pasividad. Corrosión por picaduras. EIS study of the electrochemical response vs anodic DC signáis ofAA5083alloyAbstract Electrochemical Impedance Spectroscopy (EIS) has been applied to characterise the behaviour of AA5083 alloy samples under anodic polarisation in a 3.5 % NaCl solution. EIS spectra were obtained at different DC potentials falling within the passivity range characteristic of the anodic polarisation branch of this alloy in the cited corrosive environment. Three different types of electrochemical response, with specific features in the corresponding Nyquist diagrams, were observed within the potential range covered in this study. The different type of spectra have been fitted with equivalent circuits. The evolution of the valúes of the different elements in the circuits as a function of the applied DC polarisation potential has been established. The analysis of these data has allowed us to determine the ranges of polarisation potentials where the passivation layer remains stable, metastable pits are nucleated or where stable pits grow. Finally, the use of a "Bode Surface Plot" has been proposed to get a better visualization of the evolution of the system with the applied DC potential.Keywords: EIS. AA5083. Anodic branch. Passivity. Pitting corrosión. INTRODUCCIÓNEn medios naturales, el aluminio presenta alta resistencia a la corrosión debido a la formación sobre su superficie de una película de óxido, de alto (*) Dpto. poder protector. Dicha película se desarrolla de forma casi inmediata al exponer el aluminio en atmós-feras húmedas o en electrólitos acuosos neutros. En general, el comportamiento pasivo del aluminio está directamente relacionado con la naturaleza del electrólito donde se encuentra, dado que, tanto el espesor y la estructura de la capa pasiva como su estabilidad dependen de la composición de dicho electrólito y del potencial del sistema (1). Así, en medios que contienen iones agresivos, como, por ejemplo, iones cloruro, puede producirse la

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Electrochemical impedance spectroscopy as a tool to obtain mechanistic information on the passive behaviour of aluminium

Cited by 122 publications

References 18 publications

Multiscale Electrochemical Study of Welded Al Alloys Joined by Friction Stir Welding

Multiscale Electrochemical Study of Welded Al Alloys Joined by Friction Stir Welding

Corrosion Inhibition of Aluminium in Acidic Media by Different Extracts of Trigonellafoenum-graecum L Seeds

Estudio mediante EIS de la respuesta electroquímica de la aleación AA5083 frente a señales DC anódicas

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