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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Ultrafine Grained and Nanostructured Materials
- نوع مقاله: Journal Article
- کلمات کلیدی: corrosion,Nanocomposite,aluminum,Electrolyte,Plasma Electrolytic Oxidation,nickel sulfate
- چکیده:
- چکیده انگلیسی: Plasma electrolytic oxidation (PEO) was performed on a 1010 Aluminum alloy. To achieve the
nanocomposite structure, Si3N4 nanoparticles were added into the electrolyte. In an alkaline aqueous
suspension (silicate-based), the effect of adding NiSO4 on the applied voltage, microstructure,
composition, wear, and corrosion resistance of PEO coatings was investigated using Scanning
Electron Microscopy (SEM), elemental analysis with Energy Dispersive Spectroscopy (EDS), X-Ray
Diffraction (XRD), cyclic polarization test, and pin-on-disk wear test. The results showed that adding
nickel sulfate (NiSO4) and infiltration of its constituents into coatings lead to a more favored corrosion
behavior. Moreover, in the case of best sample, anodic current at the highest applied potential
condition during the cyclic polarization test indicated a drop within two decades. Moreover,
coefficient of friction decreased almost by half.- انتشار مقاله: 10-05-1394
- نویسندگان: Ali Abolhasani,Mahmood Aliofkhazraei,Seyed Saeed Farhadi,Alireza Sabour Rouhaghdam,Masoud Asgari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Nanostructures
- نوع مقاله: Journal Article
- کلمات کلیدی: nanoparticle,Al2O3,Chemical preparation,Microwave processing
- چکیده:
- چکیده انگلیسی: In present study we used five green plants for microwave assisted synthesis of Alumina nanoparticles from Aluminum nitrate. Structural characterization was studied using x-ray diffraction that showed semi- crystalline and possibly, amorphous structure. Fourier infrared spectroscopy was used to determine Al-O bond and functional groups responsible for synthesis of nanoparticles. FTIR confirmed existence of Al-O band and bio-functional groups, originated from plant extract. Morphology and size of nanoparticles were investigated using scanning electron microscopy, transmission electron microscopy and atomic force microscopy techniques. It was observed that nanoparticles have near-spherical shape. Average size of clusters of nanoparticles varied with different routes from of 60 nm to 300 nm. AFM images showed that Individual nanoparticles were less than 10 nm.
- انتشار مقاله: 23-07-1395
- نویسندگان: Meisam Hasanpoor,Houman Fakhr Nabavi,Mahmood Aliofkhazraei
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Mechanical Research and Application
- نوع مقاله: Journal Article
- کلمات کلیدی: Methanol,Pulse electrodeposition,Nickel-alumina nanocomposite,Al2O3 nanoparticles
- چکیده:
- چکیده انگلیسی: To enhance the mechanical properties in Ni-alumina nanocomposite coatings, it is necessary to increase the amount of alumina nanoparticles participation in nickel matrix. The aim of this study is the compassion investigation of Ni-Al2O3 nanocomposite coatings’ embedded nanoparticles affected by methanol addition to the electrolyte. In this investigation the composition of electrolyte was modified by adding methanol organic solvent. The coating were produced by pulse current and under ultrasonic agitation .After the electroplating process, the coatings’ cross sectioned and the amount of incorporated alumina nanoparticles and the morphology of each coating was analyzed by Energy X-ray spectroscopy (EDX) coupled with an Scanning Electron Microscopy (SEM). The results showed that with adding the methanol organic solvent to the Watt’s solution the zeta potential of the nanoparticles increased from -4.1mV to +24.5mV and subsequently, the content of alumina reinforcement nanoparticles increased from 4.6vol. % to 11vol. %. It has been assumed that methanol surfactant may act as a surface agent that affected the hydrated layer on the nanoparticles and it promoted the co-deposition of nano alumina particles with nickel.
- انتشار مقاله: 25-12-1395
- نویسندگان: Sadegh Mirzamohammadi,Hamid Khorsand,Mahmood Aliofkhazraei
- مشاهده