You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass

    Study of Corrosion Initiation of a Steel Panel from a Defect in Coating Using Localized Electrochemical Impedance Spectroscopy (LEIS)

    Published: 01 January 2009

      Format Pages Price  
    PDF (4.6M) 17 $25   ADD TO CART
    Complete Source PDF (42M) 318 $75   ADD TO CART

    Cite this document

    X Add email address send
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    Localized Electrochemical Impedance Spectroscopy (LEIS) was used to study corrosion initiation of a cold-rolled steel panel covered by electrodeposited coating (Ecoat). LEIS technique, developed from the conventional electrochemical impedance spectroscopy (EIS) that usually measures the impedance over an area in square centimetres, can measure the impedance of a sample over a much smaller area, which makes it a more appropriate technique for studying the early stage of corrosion initiated from small defects, such as pinholes and voids in the protective coatings. In the presented study, an isolated pinhole in the coating was found first, and then the sample was immersed in a salt solution. Initiation and development of corrosion from the pinhole was closely monitored. LEIS spectra measured in different stages showed interesting variations. The corresponding equivalent circuits were introduced to study the process, followed by brief explanation of the process. The study helped us better understand the mechanism of the corrosion initiation and its early development.


    corrosion, EIS, LEIS

    Author Information:

    Wu, Xiaomei
    Eastern Michigan University, Ypsilanti, MI

    Wang, Tie
    Ford Motor Company, Dearborn, MI

    Montalvo, Eva
    Eastern Michigan University, Ypsilanti, MI

    Provder, Theodore
    Eastern Michigan University, Ypsilanti, MI

    Handsy, Carl

    Shen, Weidian
    Eastern Michigan University, Ypsilanti, MI

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP48745S