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99193 PITTING CORROSION MONITORING WITH AN IMPROVED ELECTROCHEMICAL NOISE TECHNIQUE

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Product Number: 51300-99193-SG
ISBN: 99193 1999 CP
Author: W. F. Bogaerts, J. F. Chen, J. Shadley and E. F. Rybicki
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The electrochemical emission spectroscopy (EES) technique is a newly developed on-line corrosion monitoring technique, which is capable of detecting localized corrosion as well as measuring uniform corrosion. The main difference between this technique and the traditional electrochemical noise technique is the use of an inert microelectrode to sense the current signal from a working electrode instead of using two identical working electrodes to generate the current signal. In this paper, the ability of the EES technique is evaluated for pitting corrosion monitoring. Pitting corrosion is generated on three systems: stainless steel types 304 and 316 in aerated 3% NaCl solution at 50°C and stainless steel type 304 in 6% FeCl3 solution at room temperature. In all cases, the on-set of pitting corrosion is clearly indicated in both potential and current spectrums. A parameter called the “corrosion admittance”, which is defined in the EES technique, is capable of indicating instantaneous localized corrosion activities. Keywords: corrosion monitoring, pitting corrosion, electrochemical noise, electrochemical emission spectroscopy (EES).
The electrochemical emission spectroscopy (EES) technique is a newly developed on-line corrosion monitoring technique, which is capable of detecting localized corrosion as well as measuring uniform corrosion. The main difference between this technique and the traditional electrochemical noise technique is the use of an inert microelectrode to sense the current signal from a working electrode instead of using two identical working electrodes to generate the current signal. In this paper, the ability of the EES technique is evaluated for pitting corrosion monitoring. Pitting corrosion is generated on three systems: stainless steel types 304 and 316 in aerated 3% NaCl solution at 50°C and stainless steel type 304 in 6% FeCl3 solution at room temperature. In all cases, the on-set of pitting corrosion is clearly indicated in both potential and current spectrums. A parameter called the “corrosion admittance”, which is defined in the EES technique, is capable of indicating instantaneous localized corrosion activities. Keywords: corrosion monitoring, pitting corrosion, electrochemical noise, electrochemical emission spectroscopy (EES).
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