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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.
oxidation, electrochemical corrosion, magnetic particles, iron particles, archival stability, relative humidity, silicon, magnetic moment, degradation kinetics, passivation
Manager, Ampex Recording Media Corporation, Redwood City, CA
Professor, San Jose State University, San Jose, CA