Liste des documents
Microstructural, morphological, mechanical and tribological characterization of nanocrystalline nickel and Ni-Co electrodeposited coatings
The nanocrystalline nickel and nickel-cobalt coatings were electrodeposited on an A60 steel substrate in a modified Watts bath. The observation of the coatings produced by scanning electron microscopy (SEM) showed that the nickel coatings have a granular structure whereas the Ni-Co alloy... Voir les détails
Mots clés : Nickel coatings, Ni-Co coatings, microstructure, morphology, Micro-hardness, Tribological properties
DFT study of F atom adsorption on Si(001) surface
We have investigated the initial adsorption of an fluorine (F) atom on Si(001) surface by means of first-principles calculations using pseudopotential method implemented in SIESTA code. Three high-symmetric adsorption sites of F on Si(100) were examined : top, bridge and hollow sites. For an F... Voir les détails
Mots clés : DFT, SIESTA, Silicon, fluorine, adsorption
Structural, Morphological and Optical Properties of Zn(1−x)CdxO thin films grown on a glass substrate by spray pyrolysis method.
Method on the glass substrate at 450°C.For Cd doping, various concentrations of cadmium nitrate Cd(NO3) (2–8 wt%) was used in the spraying precursor solution. The structural, Zinc oxide (ZnO) and ZnxCd1-xO thin films were deposited using a low cost spray pyrolysis morphological, and... Voir les détails
Mots clés : Cd-doped ZnO, Spray pyrolysis, X-ray diffraction, optical properties
Evolution of texture and residual stresses with the thickness for aluminum nitride deposited by dcMS on Si (100)
This work presents a study of XRD measurements on the development of the fiber (0001) and residual stress with the film thickness. Aluminum nitride (AlN) films were deposited by dc magnetron sputtering (dcMS) on Si (100) substrates in Ar-Ngaz mixture, at different thickness. The texture... Voir les détails
Mots clés : AlN thin films, DC-PVD, Fiber texture, Asymmetry
The Inhibition Effect of Gum Arabic on the Corrosion of Carbon Steel in Hcl Medium
The inhibition effect of exudate gum from Acaciatrees (Gum Acacia, GA) on the corrosion of carbon steel API 5LX60in acidic media1 M was studied by weight loss,electrochemical polarization methods; also, surface morphology.The results of weight loss and electrochemical polarization methods... Voir les détails
Mots clés : Gum Arabic, corrosion, steel, inhibition efficiency, inhibitor
NUCLEATION AND FORMATION OF OXIDE FILM UNDER A MAGNETIC FIELD
Nucleation and formation of an oxide film in contact with sliding unidirectional dry were studied in a vacuum chamber with and without the application of a magnetic field to identify the role of the intensity of magnetic field on the oxidation wear. The wear tests of AISI 1045 steel / steel AISI 1045... Voir les détails
Mots clés : friction, wear, Oxidation, environment gas
Identification of Fe-Al intermetallic phases in aluminide coatings on mild steel
Mild steel were coated by hot-dipping in molten aluminum bath at 800°C and 1000°C for 90 minutes. Phase identification of the Fe-Al intermetallic compounds in the hot-dipped aluminide mild steel was carried out by using a combination of scanning electron microscope (SEM), energy... Voir les détails
Mots clés : Mild steel, Hot-dipping, intermetallic Compounds, Aluminide layer, EBSD.
A comparative study of potentiostatic and pulsed Electrodeposition of ZnS nanostructures
Electrochemical, structural and optical properties of ZnS thin films deposited by either potentiostatic or pulsed electrodeposition were investigated. The grown thin films of ZnS from the both processes were studied by means of Mott-Schottky (MS), AFM, XRD, Raman and UV-Vis spectrometry... Voir les détails
Mots clés : ZnS, Mott-schottky, pulse, potentiostatic, XRD
Corrosion study of Neodymium-Iron-Boron alloys: Neutron reflectometry of the ultra-thin polymer film interfaces and effectiveness of polymer coatings
Neodymium-iron-boron alloys are very sensitive, particularly to the air humidity. The aim of this work is to study the effectiveness of polymer coatings against corrosion in the cases cited above. This work is financially supported by the Research Thematic Agency in Science and Technology. In this... Voir les détails
Mots clés : rare earths, magnet, corrosion, polymer coatings
Structural and morphological characterization of thin films based on zinc oxide
Zinc oxide (ZnO) is a semiconductor wide direct gap (3.37 eV), which has many interesting properties (chemical, piezoelectric, optical, catalytic ...) .A wide range of applications makes it one of the most studied materials in the last decade, especially in nanostructured form. In this work, we study... Voir les détails
Mots clés : Zinc oxidation, thin layer, Anodic polarization, Zinc oxide