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Evaluation of electrochemical impedance by means of a coulostatic method

Article Information:

Title:

Evaluation of electrochemical impedance by means of a coulostatic method

Author(s):

Y.T. Zhao, X.P. Guo

Journal:

Anti-Corrosion Methods and Materials

Year:

2006

Volume:

53

Issue:

2

Page:

95 - 101


ISSN:

0003-5599


DOI:

10.1108/00035590610650794

Publisher:

Emerald Group Publishing Limited

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Abstract:

Purpose – Aims to evaluate the impedance of a rapidly-evolving corrosion cell by developing an alternative method to the traditional frequency domain method, and to present a new method to analyze the coulostatically-induced transient (CIT).

Design/methodology/approach – The coulostatic impulse signal was used to obtain the CIT. By transforming the CIT from the time domain into the frequency domain, the coulostatically induced impedance spectrum (CIS) can be obtained, which contributes to the evaluation of the impedance of the electrode and of its corrosion processes. The equations for the coulostatic response also can be obtained by using network analysis in the Laplace domain.

Findings – Obtaining the CIS of an electrode in the time domain can facilitate accurate evaluation of metal corrosion rate in a rapidly evolving system. Compared with the traditional method for deriving CIT equations, the proposed method based on network analysis is convenient for more complex circuit models to obtain the CIT equation.

Research limitations/implications – It is difficult to obtain an impedance spectrum over a wide range of frequencies by the coulostatic measurement at one time, which perhaps limits its usefulness in systems with longer time constants.

Practical implications – The proposed method is advantageous compared with traditional analysis methods of CIT, because analysis of CIS can be conducted using commercial software and dispenses with the need for personal software to be developed, which greatly facilitates the interpretation of the coulostatic measurements involving multi-time constants.

Originality/value – It is possible that the present work may pave the way for further work to investigate more complex corrosion systems by means of CIS.

Keywords:

Electrochemical corrosion, Frequencies, Impedance voltage, Laplace transforms


Article Type:

Technical paper


Article URL:

http://www.emeraldinsight.com/10.1108/00035590610650794

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