Electrochemical Deposition of Thick Iron Oxide Films on Nickel Based Superalloy Substrates

摘要: Abstract Iron oxide films have been grown on two nickel-chromium-based superalloys, Inconel 600 and 690, by cathodic electrodeposition from an alkaline Fe(III)-Triethanolamine electrolytic solution. The deposition mechanism has studied combining thermodynamic calculations, linear sweep voltammetry the quartz crystal microbalance techniques. Films at constant potential ranging between −1.01 −1.30 V versus saturated calomel electrode (SCE). They thoroughly characterized scanning electron microscopy, focused ion beam, magnetometry X-ray diffraction. Magnetite (Fe 3 O 4 ) is deposited −1.09 V vs. SCE. Between −1.10 −1.20 V SCE a dual layered structure composed of dense inner layer porous outer thick obtained. These duplex structures are shown to be mainly magnetite contain some maghemite. Below SCE, metallic iron deposited. We defined experimental protocol parameters grow dense, highly crystallized, adhesive, with controlled thicknesses up 50 μm. show high saturation magnetization 91.6 emu g −1 small coercivity 40 Oe.