STP1000

    Electrochemical Impedance Measurements for Evaluating and Predicting the Performance of Organic Coatings for Atmospheric Exposure

    Published: Jan 1990


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    Abstract

    This paper focuses on the use of electrochemical impedance spectroscopy (EIS) as a predictive tool in assessing organic coating deterioration. EIS has been used by a number of investigators in recent years to assess coating deterioration. Good correlations between EIS data in immersion environments and other deterioration parameters exist (primarily evaluated visually). The potential use of EIS for sensing coating degradation in atmospheric exposure has not been fully evaluated. We have recently developed an atmospheric electrochemical monitor (ATMEIS) designed to assess degradation of painted metal substrates during atmospheric exposure using EIS. The monitor consists of a painted steel coupon upon which a gold electrode was electron-beam deposited to serve as a reference/counter electrode. EIS measurements are made between the underlying steel substrate and the gold reference/counter electrode residing on the coating surface. The ATMEIS has been tested both in immersion exposure and in an atmospheric exposure chamber and has been found to generate EIS data consistent with those predicted for a painted metal coupon in an aggressive environment. This aper reports the details of recent studies by other investigators in immersion environments using EIS to sense coating deterioration and discusses the design and testing of our ATMEIS monitor for atmospheric EIS.

    Keywords:

    acidic deposition, atmospheric, coating, corrosion, electrochemistry, steel


    Author Information:

    Simpson, TC
    The Johns Hopkins University, Baltimore, MD

    Moron, PJ
    The Johns Hopkins University, Baltimore, MD

    Hampel, H
    The Johns Hopkins University, Baltimore, MD

    Davis, GD
    Martin-Marietta Laboratories, Baltimore, MD

    Shaw, BA
    Martin-Marietta Laboratories, Baltimore, MD

    Arah, CO
    Martin-Marietta Laboratories, Baltimore, MD

    Fritz, TL
    The Johns Hopkins University, Baltimore, MD

    Zankel, KL
    Versar, Inc., Columbia, MD


    Paper ID: STP39203S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP39203S


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