An investigation of the effects of inorganic inhibitors on the corrosion rate of aluminum alloy using electrochemical noise measurements and electrochemical impedance spectroscopy

An investigation of the effects of inorganic inhibitors on the corrosion rate of aluminum alloy... Purpose – The purpose of this paper is to investigate the effects of inorganic inhibitors on the corrosion rate of aluminum alloy using the electrochemical noise (EN) analysis and electrochemical impedance spectroscopy (EIS) techniques. Design/methodology/approach – EN and EIS measurements were employed to study the corrosion behavior of aluminum alloy in Na 2 SO 4 (0.50 M)/NaCl(0.20 M) solution in presence of inorganic inhibitors. The time‐series noise patterns were transformed into the frequency domain using fast Fourier transformation, and then their power spectrum densities (PSDs) at specified frequencies were determined and compared with the EIS and polarization results. Findings – The EN, EIS and polarization results were in agreement. The inhibitive effect of the anions decreased in the order: CrO 4 2− >Cr 2 O 7 2− >NO 3 − >WO 4 2− >MoO 4 2− >NO 2 − . The results showed that the slope of PSD of the current (i.e. the “roll off”) was less where inhibition efficiency was greater. The spectral noise impedance and the modulus of the impedance recorded using impedance spectroscopy showed good agreement. Originality/value – This paper provides useful information relative to corrosion inhibition efficiency of the sodium and potassium salts using EN analysis technique. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

An investigation of the effects of inorganic inhibitors on the corrosion rate of aluminum alloy using electrochemical noise measurements and electrochemical impedance spectroscopy

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Publisher
Emerald Publishing
Copyright
Copyright © 2008 Emerald Group Publishing Limited. All rights reserved.
ISSN
0003-5599
DOI
10.1108/00035590810887718
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this paper is to investigate the effects of inorganic inhibitors on the corrosion rate of aluminum alloy using the electrochemical noise (EN) analysis and electrochemical impedance spectroscopy (EIS) techniques. Design/methodology/approach – EN and EIS measurements were employed to study the corrosion behavior of aluminum alloy in Na 2 SO 4 (0.50 M)/NaCl(0.20 M) solution in presence of inorganic inhibitors. The time‐series noise patterns were transformed into the frequency domain using fast Fourier transformation, and then their power spectrum densities (PSDs) at specified frequencies were determined and compared with the EIS and polarization results. Findings – The EN, EIS and polarization results were in agreement. The inhibitive effect of the anions decreased in the order: CrO 4 2− >Cr 2 O 7 2− >NO 3 − >WO 4 2− >MoO 4 2− >NO 2 − . The results showed that the slope of PSD of the current (i.e. the “roll off”) was less where inhibition efficiency was greater. The spectral noise impedance and the modulus of the impedance recorded using impedance spectroscopy showed good agreement. Originality/value – This paper provides useful information relative to corrosion inhibition efficiency of the sodium and potassium salts using EN analysis technique.

Journal

Anti-Corrosion Methods and MaterialsEmerald Publishing

Published: Jun 27, 2008

Keywords: Corrosion inhibitors; Electrochemistry; Inhibitors; Pitting corrosion

References

  • Electrochemical and theoretical investigation on the corrosion of aluminium in acidic solution containing some Schiff bases
    Yurt, A.; Ulutas, S.; Dal, H.

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