Current and potential fluctuations (electrochemical noise [EN]) between two nominally identical carbon steel electrodes were recorded in a solution of sodium phosphate (Na3PO4) at different concentrations. After passivation was reached, pitting was induced by addition of chlorides. Data were collected with different sampling rates. Linear polarization resistances (LPR) also were measured. Electrochemical signals were transposed in the frequency domains using the fast Fourier transform. Statistical parameters from the signals in the time and in the frequency domains were compared with corrosion rates (Vc) as measured by LPR. Noise resistance (Rn) also was calculated. From standard deviation (σ) values of the current and potential noises, pitting attack was revealed at its onset. Good correlation between data from the different techniques was found. Rn gave values proportional to the polarization resistance (Rp). The issue of how sampling rate can affect EN data collection also was addressed.

Gusmano, G., Montesperelli, G., Pacetti, S., Petitti, A., D'Amico, A. (1997). Electrochemical noise resistance as a tool for corrosion rate prediction. In CORROSION (pp.860-868). HOUSTON : NATL ASSN CORROSION ENG.

Electrochemical noise resistance as a tool for corrosion rate prediction

GUSMANO, GUALTIERO;MONTESPERELLI, GIAMPIERO;
1997-01-01

Abstract

Current and potential fluctuations (electrochemical noise [EN]) between two nominally identical carbon steel electrodes were recorded in a solution of sodium phosphate (Na3PO4) at different concentrations. After passivation was reached, pitting was induced by addition of chlorides. Data were collected with different sampling rates. Linear polarization resistances (LPR) also were measured. Electrochemical signals were transposed in the frequency domains using the fast Fourier transform. Statistical parameters from the signals in the time and in the frequency domains were compared with corrosion rates (Vc) as measured by LPR. Noise resistance (Rn) also was calculated. From standard deviation (σ) values of the current and potential noises, pitting attack was revealed at its onset. Good correlation between data from the different techniques was found. Rn gave values proportional to the polarization resistance (Rp). The issue of how sampling rate can affect EN data collection also was addressed.
Corrosion 96
DENVER, CO
MAR, 1996
Rilevanza internazionale
1997
Settore ING-IND/22 - SCIENZA E TECNOLOGIA DEI MATERIALI
English
carbon steel; corrosion rate; current; electrochemical noise; fast Fourier transform; linear polarization resistance; passivation; pitting; potential; sampling rate; type 1040 carbon steel
Intervento a convegno
Gusmano, G., Montesperelli, G., Pacetti, S., Petitti, A., D'Amico, A. (1997). Electrochemical noise resistance as a tool for corrosion rate prediction. In CORROSION (pp.860-868). HOUSTON : NATL ASSN CORROSION ENG.
Gusmano, G; Montesperelli, G; Pacetti, S; Petitti, A; D'Amico, A
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/53689
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact