10007

9237

كارشناسي ارشد

شناسايي و انتخاب مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1393

چهارده، 84ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

حميدرضا سليمي جزي، محمدعلي گلعذار

محمدرضا گرسيوز جزي

94/2/21

محمود منير واقفي، مسعود عطاپور

1396/09/27

كتابنامه

مواد

مهندسي مواد

ID9237

Characterization and evaluation of corrosion and tribocorrosion behavior of nanostructured TiO2 coatings prepared by anodizing at different condition Mohammad Fazel mohammad fazel@ma iut ac ir Date of submission December 14 2014 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Supervisors H R Salimijazi Assistant Professor hrjazi@cc iut ac ir M A Golozar Professor m golozar@cc iut ac ir Abstract In this paper the TiO2 coatings were performed at 20 5 and 10 oC on pure Ti and at 20 and 10 oC on Ti6Al4V alloy by Micro Arc Oxidation MAO process The treatments were performed in an electrolyte containing 1 8 M H2SO4 0 4 M H3PO4 and applied voltage of 180 V The SEM results from the surface morphologies of coatings indicated that unlike the volcanic morphology of oxide layers on pure Ti a cortex like morphology with irregular vermiform slots was seen on MAO Ti6Al4V samples Additionally the pores were sealed in sub zero spark anodized pure Ti samples The EIS analysis showed that MAO coatings were composed of a double layered oxide film consisting of a porous outer layer and a barrier inner layer The simulated data from the electrical equivalent circuit model illustrated the higher resistance of both porous and barrier layers in MAO coatings performed at 10 oC The polarization curves confirmed the higher corrosion resistance of these coatings Tribocorrosion results illustrated that the potential drop values of untreated samples was significantly increased by MAO process In addition the tribocorrosion resistance of coatings on Ti6Al4V alloy was higher than that on pure Ti SEM images of worn surfaces demonstrated the local detachment of oxide layer within the wear track of MAO coatings performed at 20 and 5 oC Conversely no delamination was detected in MAO Ti 10 and a mild abrasive wear was the dominant mechanism In the following the TiO2 nano HA composite coating was performed in situ by MAO process The results showed the low corrosion and passive current density of nanocomposite coating According to the presence of Ca in TiO2 nano HA coating confirmed by EDS analysis this nanocomposite coating can be very desirable for biological application Keywords Micro Arc Oxidation Pure Ti Ti6Al4V Corrosion Tribocorrosion TiO2 nano HA composite coating

حميدرضا سليمي جزي، محمدعلي گلعذار

محمدرضا گرسيوز جزي

محمود منير واقفي، مسعود عطاپور