SYMPOSIA PAPER Published: 01 January 1996

Electrochemical Noise Measurement for Determining Corrosion Rates


Electrochemical noise measurements (ENM), linear polarization tests and mass loss measurements were performed in sulfuric acid, acetic acid and other solutions. The ENM data were converted to corrosion rates by calculating the noise resistance, Rn = σVI where σV and σI are the standard deviations of the potential and current. Good correlation among the three methods was obtained for low to moderate corrosion rates, but poor correlation was observed for high rates. ENM has proven valuable for determining corrosion rates in lowconductivity solutions, which are not suitable for linear polarization resistance (LPR) testing, and for measuring very low corrosion rates in which mass loss tests would have required at least 30 days exposure to provide meaningful results.

Author Information

Reichert, DL
DuPont Experimental Station, Wilmington, DE
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Developed by Committee: G01
Pages: 79–89
DOI: 10.1520/STP37952S
ISBN-EB: 978-0-8031-5562-6
ISBN-13: 978-0-8031-2032-7