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


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

    Published: 0

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


    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.


    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