STP1148

    The Effect of Temperature, Humidity, and Silicon Content on the Oxidation of Fine Iron Particles

    Published: Jan 1992


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    Abstract

    In this study, the oxidation and electrochemical corrosion of Fe-Si particles used in magnetic recording are investigated under controlled thermal and relative humidity conditions. The relative humidity, above a threshold value, dominates the oxidation behavior. Oxidation kinetics increase greatly above this threshold, and a portion of the exposed particle population becomes completely oxidized. X-ray diffraction data confirm the appearance of α-Fe2O3 in addition to the usual γ-Fe2O3 following exposure to high humidities. Greater silicon content increases the threshold humidity, above which rapid degradation in magnetic properties occurs.

    Keywords:

    oxidation, electrochemical corrosion, magnetic particles, iron particles, archival stability, relative humidity, silicon, magnetic moment, degradation kinetics, passivation


    Author Information:

    Hadad, AS
    Manager, Ampex Recording Media Corporation, Redwood City, CA

    Pizzo, PP
    Professor, San Jose State University, San Jose, CA


    Paper ID: STP15055S

    Committee/Subcommittee: G01.11

    DOI: 10.1520/STP15055S


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