STP1277

    Electrochemical Noise Measurement for Determining Corrosion Rates

    Published: Jan 1996


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    Abstract

    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.

    Keywords:

    electrochemical noise, current noise, potential noise, corrosion rate, noise resistance


    Author Information:

    Reichert, DL
    Senior research engineer, DuPont Experimental Station, Wilmington, DE


    Paper ID: STP37952S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP37952S


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