Impedance Measurements of the Anodic Iron Dissolution

Schweickert, H.; Lorenz, W.J.; Friedburg, H.

doi:10.1149/1.2129982

Cited by 99 publications

(11 citation statements)

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“…The main reason for enhanced corrosion properties of BNII in comparison with CPII may be related to the difference between their microstructures. , The reasons may be attributed to the following: (1) The preferential orientation 〈111〉 (110) was dominant, and disordered orientation disappeared for BNII according to our previous work . There were a smaller number of dislocations in the rolled surface for BNII than that for CPII, resulting in the decrease of corrosion rates for both anode and cathode as shown in Figure .…”

Section: Resultsmentioning

confidence: 86%

The Electrochemical Corrosion of Bulk Nanocrystalline Ingot Iron in Acidic Sulfate Solution

et al. 2005

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The corrosion properties of bulk nanocrystalline ingot iron (BNII) fabricated from conventional polycrystalline ingot iron (CPII) by severe rolling were investigated by means of immersion test, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) tests, and scanning electron microscopy (SEM) observation. These experimental results indicate that BNII possesses excellent corrosion resistance in comparison with CPII in acidic sulfate solution at room temperature. It may mainly result from different surface microstructures between CPII and BNII. However, the corrosion resistance of nanocrystalline materials is usually degraded because of their metastable microstructure nature, and the residual stress in nanocrystalline materials also can result in degradation of corrosion resistance according to the traditional point of view.

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Section: Resultsmentioning

confidence: 86%

The Electrochemical Corrosion of Bulk Nanocrystalline Ingot Iron in Acidic Sulfate Solution

et al. 2005

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“…4). For the oscillatory systems involving passivation/depassivation of solid electrodes, significant original contribution to the impedance characteristics of such NDR systems was made by Lorenz et al [28] and Keddam et al [29][30][31] (see also classical review of electrochemical oscillators by Wojtowicz [8]). More recently, significant further contribution to this field was made by Koper and Sluyters [32][33][34][35].…”

Section: Principles and Limitations Of The Methodsmentioning

confidence: 99%

Application of Impedance Spectroscopy to Electrochemical Instabilities

Orlik

2012

Monographs in Electrochemistry

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Electrochemical impedance spectroscopy (EIS), a well-established technique in classical electrochemistry [1], can also be very useful for the analysis of stability of electrochemical systems, including diagnosis of selected bifurcations. Impedance spectra of such dynamical systems allow also classify electrochemical oscillators into respective types. In fact, due to linearization involved in the concept of impedance, this way of the stability analysis of electric (electrochemical) circuits is a specific variant of linear stability analysis described in Sect. 1.3.In this section a short presentation of the principle of impedance measurements is described, in order to make the reader familiar with the notation used further in this chapter. The basis for this summary will be typical (Randles-type) equivalent circuit from Fig. 2.6, in which Z f will henceforth mean generally the ac impedance, measured for ac frequency f [Hz] (or angular frequency o ¼ 2pf [rad s À1 ]). The idea of such equivalent circuits, coming from the seminal work of Randles [2], was concordant with the experimental equipment used in early times of impedance measurements. It involved the ac bridge, in which one branch contained the experimental system, the impedance characteristics of which had to be balanced, in the other branch, by the impedance of the electric (equivalent) circuit, possibly closely reflecting the properties of the experimental one.Typically the electrochemical cell is first brought into steady-state, or at least quasi-steady-state (E ss , I ss ) which is further perturbed with the externally applied small amplitude, sinusoidal ac voltage (typically) or ac current. As a consequence, the electrode potential E and the current I will oscillate around their steady-state values with the same frequency o, but in general case exhibiting (frequency dependent) phase difference. In general notation one can denote the phase shifts for both the electrode potential and the current as ' 1 and ' 2 , respectively, and then:M. Orlik, Self-Organization in Electrochemical Systems I, Monographs in Electrochemistry,

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“…If the model approximates the spectrum well, the measurement is considered valid, while it is considered invalid if approximation is poor [1][2][3][4]. As there is usually no constraint put on the solution, both positive and negative resistor values might be derived (generalized RC element) and are (for some systems) even necessary (see [5,6]), even though they are not meaningful in a strictly physical sense.…”

Section: Introductionmentioning

confidence: 99%