Electrochemical impedance spectroscopy (EIS) of corrosion processes on inhomogeneous surfaces

Jüttner, K.

doi:10.1016/0013-4686(90)80004-8

Cited by 726 publications

(215 citation statements)

References 32 publications

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“…The response for the uncoated Ti-6Al-4V substrate in the Nyquist complex plan is essentially a depressed semicircle. The presence of depressed semicircles, often referred to as frequency dispersion, has been attributed to high roughness and inhomogeneity of the electrode surface [38,39]. In contrast, the Nyquist plots of the three nanocrystalline coatings display flattened and incomplete capacitive arcs in the entire frequency range.…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Liu

et al. 2014

Acta Materialia

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nanocrystalline coatings were deposited onto Ti-6Al-4V substrates by a double glow discharge plasma technique. The effects of Nb alloying on the electrochemical behavior of the Ti 5 Si 3 nanocrystalline coatings were systematically investigated in a naturally aerated 5 wt.% H 2 SO 4 solution, for which various electrochemical techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostatic polarization and Mott-Schottky analysis, were employed. Moreover, to evaluate the corrosion performance of the as-deposited coatings over an extended period, their corrosion resistance was analyzed after 7 days' immersion in a 5 wt.% H 2 SO 4 solution by EIS measurements and observations of corroded surface morphologies. The results showed that the Ti 62.5Àx Nb x Si 37.5 (x = 0, 6.3, 12.5) nanocrystalline coatings exhibit superior corrosion resistance compared with Ti-6Al-4V, and their corrosion resistance is enhanced with increasing Nb content, suggesting that Nb alloying is an effective strategy for improving the corrosion protection ability of the Ti 5 Si 3 nanocrystalline coating. The roles of Nb additions in enhancing the corrosion resistance of the Ti 5 Si 3 nanocrystalline coatings can be summarized as: (a) reducing the residual tensile stresses of the as-deposited coatings and (b) tailoring the composition, compactness and electronic structure of the passive films formed. These findings are expected to broaden the application of Ti 5 Si 3 as a highly corrosion-resistant coating for engineering components operating under aggressive conditions.

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Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Liu

et al. 2014

Acta Materialia

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“…It is seen from these figures that the impedance diagrams in both the cases are not perfect semicircles. This difference has been attributed to the frequency dispersion 14 .…”

Section: Impedance Measurementsmentioning

confidence: 99%

Effect of piperidones on hydrogen permeation and corrosion inhibition of mild steel in acidic solutions

2000

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Abstract. The influence of 3-methyl-2,6-diphenyl piperidin-4-one (MDPO) and 2-phenyl decahydroquinoline-4-one (PDQO) synthesised in the laboratory on hydrogen permeation and corrosion inhibition of mild steel in 1N H 2 SO 4 has been studied using weight loss and various electrochemical AC and DC corrosion-monitoring techniques. Both the compounds inhibit the corrosion of mild steel in H 2 SO 4 . Potentiodynamic polarisation studies clearly reveal that they behave predominantly as cathodic inhibitors. The extent of decrease in hydrogen permeation current through steel surfaces has been studied by the hydrogen electropermeation technique. Double layer capacitance (C dl ) and charge transfer resistance (R t ) values are derived from Nyquist plots obtained from AC impedance studies. The adsorption of these compounds on mild steel surfaces from H 2 SO 4 obeys Temkin's adsorption isotherm.

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“…The diagram can be interpreted using two time constants, the one at high frequency is due to the charge transfer process of the intervalence complex whereas the second, at low frequency, is attributed to the capacitive process including diffusion of K + into the internal pores of the intervalence complex. 37,39 The inset figure shows the equivalent circuit that best fits the experimental data for SZC30/CuHCF. The system is formed by two layers: 1) an external one that is formed by a capacitor C 1 in parallel with resistance R 1 of the layer and 2) a second internal layer that contains a capacitor C 2 in parallel with the resistance of layer R 2 and the Warburg impedance element (Zw) that measures the diffusion processes of the potassium ions at the electrode surface.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Thin film of copper hexacyanoferrate dispersed on the surface of a conducting carbon ceramic material, SiO2/ZrO2/C-graphite: characteristics and electrochemical studies

Marafon

Lucho

Francisco

et al. 2006

J. Braz. Chem. Soc.

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O material SiO 2 /ZrO 2 /C-graphite (SZC) foi preparado pelo método sol-gel apresentando duas composições, designadas por: (a) SZC30 (SiO 2 = 50%, ZrO 2 = 20%, C= 30%) e (b) SZC20 (SiO 2 =60%, ZrO 2 = 20%, C= 20%) em % m. A estrutura do material foi investigada por difração de raios X (XRD), microscopia eletrônica de transmissão de alta resolução (HR-TEM) e espectroscopia de fotoelétrons excitados por raios X (XPS). A condutividade elétrica dos discos prensados destes materiais foi 4 e 18 S cm -1 para SZC20 e SZC30, e a área superficial específica (determinado pelo método BET) dos compósitos carbono cerâmico foi 45 e 12 m 2 g -1 , respectivamente. Um filme fino de hexacianoferrato(II) de cobre foi formado in situ na superfície do material contendo 30 % (em massa) de grafite (SZC30). A espessura do filme foi estimada como sendo 110 nm. O potencial médio para o processo redox foi dependente da concentração de eletrólito suporte na faixa de 0,1 a 1,0 mol L -1 de KCl e a resistência de transferência de carga, determinada por espectroscopia de impedância eletroquímica (EIS), foi de 23,8 ohm cm 2 .SiO 2 /ZrO 2 /C-graphite materials (SZC) were prepared by the sol-gel method presenting two compositions and designated as: (a) SZC30 (SiO 2 = 50%, ZrO 2 = 20%, C= 30%) and (b) SZC20 (SiO 2 =60%, ZrO 2 = 20%, C= 20%) in wt.%. The material structure was investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). The electrical conductivities obtained for the pressed disks of these materials were 4 and 18 S cm -1 for SZC20 and SZC30, and the specific surface areas (determined by the BET method) of the carbon ceramic composites were 45 and 12 m 2 g -1 , respectively. A copper hexacyanoferrate thin film was grown in situ on the material surface containing 30 wt.% C (SZC30). The thickness of the film was estimated as 110 nm. The midpoint potential for the redox process was dependent on the KCl supporting electrolyte concentrations in the range between 0.1 and 1.0 mol L -1 and the charge transfer resistance determined by electrochemical impedance spectroscopy experiment was 23.8 ohm cm 2 .Keywords: silica-zirconia-graphite, carbon ceramic material, conducting ceramic material, copper hexacyanoferrate film IntroductionTransition metal hexacyanoferrates have been the subject of widespread interest because of their electrocatalytic, electrochromic, ion exchange, ion sensing and photomagnetic properties, as recently pointed out in a review where electrosynthesis, in situ characterization and technological applications of Prussian Blue analogues are emphasized. 1 These metal hexacyanoferrate compounds are usually prepared by chemical and electrochemical methods. To support films of these materials on solid surfaces, when necessary, inert substrates such as glassy carbon, graphite, platinum or gold have been used. [2][3][4][5][6][7] Porous substrates such as SiO 2 coated with thin films of SnO 2 , TiO 2 and ZrO 2 have also been used as substrates to adher...

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Electrochemical impedance spectroscopy (EIS) of corrosion processes on inhomogeneous surfaces

Cited by 726 publications

References 32 publications

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Niobium addition enhancing the corrosion resistance of nanocrystalline Ti5Si3 coating in H2SO4 solution

Effect of piperidones on hydrogen permeation and corrosion inhibition of mild steel in acidic solutions

Thin film of copper hexacyanoferrate dispersed on the surface of a conducting carbon ceramic material, SiO2/ZrO2/C-graphite: characteristics and electrochemical studies

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