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
    STP1188

    Characterization of the Corrosion of Aluminum Thin Films Using Electrochemical Impedance Methods

    Published: 01 January 1993


      Format Pages Price  
    PDF (388K) 21 $25   ADD TO CART
    Complete Source PDF (7.3M) 471 $119   ADD TO CART

    Cite this document

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


    Abstract

    Characterization of a variety of electrochemical parameters associated with the corrosion of aluminum, Al-Cu, and Al-Si alloy thin films (∼1-μm-thickness) in dilute hydrofluoric acid (HF) has been accomplished using electrochemical impedance spectros-copy (EIS). Phenomena characterized include the transition from passive to active dissolution with increasing HF concentration, determination of diffusional impedances associated with ionic transport through the passive oxide, detection of the initiation and repassivation of a population of metastable pits, changes in aluminum oxide resistivity and state of hydration at open circuit potential (OCP), and establishment of trends in oxide film growth with anodic potential. Impedance studies on model intermetallic phases and artificial pits were also conducted in order to aid in the interpretation of these phenomena. A survey of the analyses and interpretation methods utilized to obtain such information from impedance spectra is presented.

    Keywords:

    aluminum oxide film, electrochemical impedance, diffusional impedance, hydrofluoric acid, metastable pitting, oxide capacitance, oxide resistance, passivity, pit capacitance, repassivation, theta phase precipitates


    Author Information:

    Scully, JR
    Assistant professor, University of Virginia, Center for Electrochemical Sciences and Engineering, Charlottesville, VA


    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP18075S