Bucharest, Romania
Bucharest, Romania

Time filter

Source Type

Florea A.,PSV Company SA | Anicai L.,PSV Company SA | Costovici S.,FELIX IT SA | Golgovici F.,Polytechnic University of Bucharest | Visan T.,Polytechnic University of Bucharest
Surface and Interface Analysis | Year: 2010

This study deals with some preliminary experimental results regarding the electrodeposition and characterization of Ni and Ni alloy coatings, respectively, Ni-Mo and Ni-Sn, from some choline chloride-based ionic liquids. The obtained Ni deposits are adherent, uniform onto Cu substrate. According to X-ray diffraction investigations, average sizes of the crystallites have been in the range of 9.2-14.4 nm, higher for increased applied current densities, maybe as a result of the increase in temperature during electrodeposition. In addition, an amorphous phase was evidenced. Ni-Mo alloy coatings have been obtained for the first time from ionic liquids containing 0.42 M NiCl 26H 20 and 0.016 M ammonium heptamolybdate in choline chloride-urea- citric acid or chloline chloride-ethylene glycol-citric acid mixtures. Ni-Sn alloys were formed in choline chloride-urea and choline chloride-ethylene glycol solvents, with various additions of Ni and Sn salts. The obtained alloy deposits are adherent, uniform onto Cu substrate. To obtain information on the deposits' morphology and composition, atomic force microscopy, SEM and energy-dispersive X-ray techniques were used and the results are discussed taking into account the ionic liquid type, composition and conductivity in close correlation with electrochemical conditions. Copyright © 2010 John Wiley & Sons, Ltd.

Popescu A.-M.,Ilie Murgulescu Institute of Physical Chemistry | Constantin V.,Ilie Murgulescu Institute of Physical Chemistry | Florea A.,PSV COMPANY SA | Baran A.,Ilie Murgulescu Institute of Physical Chemistry
Revista de Chimie | Year: 2011

The present paper is a preliminary study on preparation and properties of some choline chloride based ionic liquids. Three mixtures (1:2 molar ratio) of choline chloride (2-hydroxy-ethyl-trimethyl-amonium chloride) with urea, malonic acid and citric acid were prepared and characterized. The obtained ionic liquids were clear and colorless at room temperature. Some physical properties, namely, density, electrical conductivity and viscosity of these mixtures were investigated as a function of temperature within a of25-80°C. The Arrhenius theory and the Frenkel equation were used for understanding the transport phenomena in these ionic liquids.

Prioteasa P.,INCDIE ICPE Advanced Research | Golgovicp F.,Polytechnic University of Bucharest | Sbircea G.,INCDIE ICPE Advanced Research | Anicai L.,PSV Company SA | Visan T.,Polytechnic University of Bucharest
Revista de Chimie | Year: 2010

The paper presents experimental results regarding the electrodeposition and physico-chemical characterization of Ni-Mo alloys prepared from ammonium-citrate aqueous electrolyte containing NiSO 4 (0.35M), Na 2MoO 4 (0.03M), Na 3 Citrat (0.2M), H 3BO 3(0.48M) and additions of ammonia, saccharine, lauryl sulfate and/without brightening agent (RADO 570); pH=6-6.5. Other operating conditions were: 2-8Adm -2 current densities, 55-70°C and 30-120min electrolysis time. The structure, morphology, roughness and hardness of Ni-Mo deposits were discussed. Investigations dealing with their corrosion behavior, involving potentiodynamic polarization curves and electrochemical impedance spectroscopy in 0.5M NaCl solution, are also presented.

Golgovici F.,Polytechnic University of Bucharest | Cojocaru A.,Polytechnic University of Bucharest | Anicai L.,PSV Company SA | Visan T.,Polytechnic University of Bucharest
Materials Chemistry and Physics | Year: 2011

Investigations of obtaining BiSb, BiTe, SbTe and BiSbTe films in concentrated chloride aqueous solution (5 M NaCl + 1 M HCl) or in ionic liquid based on choline chloride + malonic acid mixture were reported. The concentrations of Bi, Sb, Te, existing as complex anions due to high Cl - concentration, were within 10-90 mM. The measurements were carried out at room temperature for aqueous medium and 85 °C for ionic liquid. Cyclic voltammetry and electrochemical impedance spectroscopy using Pt electrode were used for investigating the interface process in both electrolytes. The morphology and chemical composition of films deposited on Cu in chloride aqueous solution using current pulses or potential pulses were determined by AFM and SEM microscopy. For BiSb, the effects of change from unipolar to reverse pulses and increase in cathodic current were shown as favorable. SEM images for BiSbTe confirmed the morphology modification by increasing the current pulses, while energy dispersive spectroscopy analyses indicate a dramatic change of composition. © 2010 Elsevier B.V. All rights reserved.

Prioteasa P.,ICPE Advanced Researches | Anicai L.,PSV Company SA | Visan T.,Polytechnic University of Bucharest
UPB Scientific Bulletin, Series B: Chemistry and Materials Science | Year: 2010

Among electrochemical processes having a considerable impact on technical development, the electrodeposition of Ni-Mo alloys plays an important role, due to better mechanical, anticorrosive and thermal stability characteristics of these alloys. This process is an ecological alternative to chromium plating, belonging to so-called 'induced co-deposition' systems, when nickel's reaction rate enhances the codeposition. With this in view, the paper presents some experimental results regarding the electrodeposition and physical-chemical characterization of Ni-Mo alloys involving ammonium-citrate aqueous electrolyte. Some investigations dealing with their corrosion resistance, involving potentiodynamic polarization curves and electrochemical impedance spectroscopy spectra in 0.5M NaCl, for various immersion periods, are also presented.

Anicai O.,Institute for Computers ITC SA | Anicai L.,PSV COMPANY SA
Clean - Soil, Air, Water | Year: 2011

With a need for the management of petroleum contaminated sites on Romanian territory, an experimental software platform involving ESRI-ArcGIS technologies (BIOREGIS) is presented in this study. The BIOREGIS platform is aimed to: (i) Build the structure of relational, standardized databases to store spatial and textual characteristic information on polluted sites for further risk analysis and planning of remediation actions, (ii) improve the pollution risk assessment methodology for Romanian petroleum contaminated sites and its informatics implementation, and (iii) develop and operate the software platform for pollution risk based management involving GIS/remote sensing technologies and remediation activities. The operation of BIOREGIS has been tested for a pilot contaminated area situated at Razvad - Dambovita County, which has been subjected to in situ remediation procedures involving both bioremediation and electrokinetic processes. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Loading PSV COMPANY SA collaborators
Loading PSV COMPANY SA collaborators