Method of studying corrosion processes of metal electrodes by surface voltage fluctuations

Authors

  • Yurii Striletskyi Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019, Ukraine https://orcid.org/0000-0002-0105-8306
  • Victor Rovinskyy Vasyl Stefanyk Precarpathian National University Shevchenko str., 57, Ivano-Frankivsk, Ukraine, 76000, Ukraine
  • Olga Yevchuk Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019, Ukraine

DOI:

https://doi.org/10.15587/1729-4061.2016.71969

Keywords:

electrochemical corrosion, electrical noise voltage shape of probability distribution of instantaneous signal values, information entropy of instantaneous signal values

Abstract

The way of study of corrosion processes on the surface of the metal electrode based on the results of observations of voltage fluctuations on it is proposed.

The signal processing device for voltage measured on the surface of the metal electrode is developed. The device comprises a differential amplifier, bandpass filter and amplifier with controllable gain. The method of testing of the developed device is described. The research of the electrical noise voltage of the steel electrode immersed in an electrolyte solution is performed. The occurrence of the spectral component at the frequency of 10–12Hz during a series of experiments was observed. The searchfor sustainable criteria for evaluating the presence of corrosion processes in the studied surface area revealed that the most informative parameter in the study of voltage fluctuations associated with corrosion processes on the surface of the metal electrode is the shape of probability distribution of instantaneous values of voltage and evaluation of information entropy. The shape of the probability distribution can be a source of additional information on the progress of electrochemical reactions on the surface because dry electrode signal distribution law was similar in shape to normal. Changing the shape of this distribution with the introduction of additional local maximum shows the influence of extraneous input sources, which can be an electrochemical reaction. Information entropy estimation of instantaneous signal values at lower settlement expenses made it possible to distinguish between the results of different experiments. The changing information entropy of instantaneous values, means the changed properties of the sources of electrical signals on the surface of the investigated electrode. The research enables to carry out external monitoring of corrosion processes on the inner surface of metal pipes.

Author Biographies

Yurii Striletskyi, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, associate professor

Departments “Methods and instruments of quality control and certification”

Victor Rovinskyy, Vasyl Stefanyk Precarpathian National University Shevchenko str., 57, Ivano-Frankivsk, Ukraine, 76000

PhD, associate professor

Department "Informatics"

Olga Yevchuk, Ivano-Frankivsk National Technical University of Oil and Gas Karpatska str., 15, Ivano-Frankivsk, Ukraine, 76019

PhD, associate professor

Department "Technology systems management and automation"

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Published

2016-06-27

How to Cite

Striletskyi, Y., Rovinskyy, V., & Yevchuk, O. (2016). Method of studying corrosion processes of metal electrodes by surface voltage fluctuations. Eastern-European Journal of Enterprise Technologies, 3(9(81), 24–29. https://doi.org/10.15587/1729-4061.2016.71969

Issue

Vol. 3 No. 9(81) (2016): Information and controlling system

Section

Information and controlling system

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Copyright (c) 2016 Yurii Striletskyi, Victor Rovinskyy, Olga Yevchuk

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