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electrolytic-polishing
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On the growth sequence of highly ordered nanoporous anodic aluminium oxide
, Article Materials and Design ; Volume 27, Issue 10 , 2006 , Pages 983-988 ; 02613069 (ISSN) ; Nasirpouri, F ; Iraji zad, A ; Saedi, A ; Sharif University of Technology
Elsevier Ltd
2006
Abstract
Anodic aluminium oxide films were fabricated by well known two-step anodizing process in oxalic acid electrolyte. The ordering characteristics (ordered pore domains, average pore diameter size and through-pore arrangement) of anodic aluminium oxide films, obtained in different growth sequences, were identified by microscopic analysis such as ex situ contact-mode atomic force microcopy and scanning electron microscopy. Flattened areas in which some pits are seen mostly cover the electropolished surface of aluminium. Single anodizing of aluminium produces a broad distribution of nanopore size, whereas induces a highly ordered hemispherical pattern, which plays the ordered nucleation sites for...
Microstructural investigation of hard phases in as-cast Ni-Ti memory alloy
, Article Praktische Metallographie/Practical Metallography ; Volume 42, Issue 9 , 2005 , Pages 454-469 ; 0032678X (ISSN) ; Sadrnezhaad, S. K ; Sharif University of Technology
Carl Hanser Verlag
2005
Abstract
Ti4Ni2O, Ti4Ni2N, TiC and Ti2Ni are brittle compounds usually formed during production and processing of the Ti-Ni SMA alloys. These compounds adversely affect on workability and shape memory properties of the alloy. This paper presents most recent findings related to the morphologies of various inclusions and Ti-Ni phases formed during and after vacuum induction melting and casting of Ti-45wt.% Ni material. Cast samples were mechanically and/or electrolytically polished and etched. Extensive optical and scanning electron microscopic studies were carried out to characterize the composition and microstructure of the as cast Ti-Ni alloys. Results indicated that mechanical polishing followed by...
Electropolishing effect on corrosion resistance of electrodeposited nanocrystalline Ni-Mo alloy coatings in NaCl solution
, Article ECS Transactions ; Volume 45, Issue 19 , 2013 , Pages 65-76 ; 19385862 (ISSN) ; 9781623320355 (ISBN) ; Allahyarzadeh, M. H ; Ashrafi, A ; Shadizadeh, S. R ; Seddighian, A ; Sharif University of Technology
2013
Abstract
The aim of current research is to investigate the substrate electropolishing effect on corrosion resistance of Ni-Mo thin films. For this purpose, corrosion resistance of coatings deposited on mild steel substrates, that was electropolished or mechanically polished, have been compared in 3.5 wt.% NaCl solution using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The structural properties of Ni-Mo thin films were evaluated using X-ray diffraction (XRD) and their morphology, microstructure and chemical composition were also investigated using scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). Temperature and acidity of deposition...
Self-limited growth of large-area monolayer graphene films by low pressure chemical vapor deposition for graphene-based field effect transistors
, Article Ceramics International ; Volume 43, Issue 17 , 2017 , Pages 15010-15017 ; 02728842 (ISSN) ; Razzaghi, Z ; Ghadiani, B ; Tamizifar, M ; Mohmmadi, M. H ; Simchi, A ; Sharif University of Technology
Abstract
During the last decade, fabrication of high-quality graphene films by chemical vapor deposition (CVD) for nanoelectronics and optoelectronic applications has attracted increasing attention. However, processing of large-area monolayer and defect-free graphene films is still challenging. In this work, we have studied the effect of processing conditions on the self-limited growth of graphene monolayers on copper foils during low pressure CVD both experimentally and theoretically based on thermokinetics and kinetics of Langmuir adsorption. The effect of copper pre-treatment, growth time, and carbon potential of the atmosphere (indicated by the methane-to-hydrogen gas ratio, r) on the quality of...