Preparation And Morphology Research Of Supported Iron Oxide On Carbon Steel Surface

With the development of micro-nano technology, iron oxide materials play anincreasingly important role in catalysis and photocatalysis, gas sensor, magneticmaterials and wastewater treatment due to its high efficiency, low-cost and excellentenvironmental compatibility, adsorption performance. However, the supportedtechnology of iron oxide micro-nano materials has been a bottleneck whichseriously hinders its further application.In this paper, a supported iron oxide film is in situ prepared respectively bymicro-arc oxidation method, hydrothermal method and heat treatment method oncarbon steel surface. Then the effect of electric parameters, electrolyte parametersand electrolyte species on the film morphology is studied by micro-arc oxidationmethod, so as the effect of pretreatments, reaction conditions and the surfaceadditives on the microstructure of the film by hydrothermal method, and the effectof the film surface pretreatment process, reaction conditions on the film morphologyby heat treatment method. The aftertreatment method of iron oxide films which areprepared by micro arc oxidation method and hydrothermal method is also explored,finally the morphology and structure of iron oxide film are characterized by SEM,XRD and EDS methods.The experimental results showed that the iron oxide film layer of porousmorphology can be prepared by micro-arc oxidation method, the film morphology isseriously influenced by the power mode which reflects that the square wave pulsepower tends to generate amorphous wrinkle-shaped iron oxide film with goodcombination force, its diameter ranges from2um to4um, and the DC pulse electricsource tends to grow a thick crystalline eruption-shaped film, its aperture around at5um. Different sizes, morphologies and dispersiones of submicron iron oxides canbe prepared by hydrothermal method, including-Fe2O3, Fe3O4,-FeOOH whichhave the rich morphologies such as "cubic shap","rain umbrella shap","hexagonshape","bar shap", its size ranges from100nm to2um which reflects the regulatoryeffect of chemical polishing, reaction temperature and surface additives on themorphology is particularly significant, and reveals that the content of dissolvedoxygen is an important condition for a reaction product. Heat treatment method canprepare various morphologies such as nanowires, nanobelts and nano films, for nanofilms, the thickness is100nm and the width is800nm, the length of nanobelts canrise up to several microns, the diameter of nanowires is less than50nm, and thelength can reach up to several micrometers, the research indicates that thepretreatment process of film layer has little influences on the morphology, higher treat temperature means more nanowires, but also means the collapse of filmmorphology possibly, finds that the coating components-Fe2O3and Fe3O4growtogether under the condition of heating.