A5041722414- Electrodeposition and Electroless Coatings
- Corrosion Behavior and Inhibition
- Electrochemical Analysis and Applications
- Hydrogen embrittlement and corrosion behaviors in metals
- Metal and Thin Film Mechanics
- Pigment Synthesis and Properties
- Nanoporous metals and alloys
- Copper Interconnects and Reliability
- Electrochemical sensors and biosensors
- Anodic Oxide Films and Nanostructures
- Thin-Film Transistor Technologies
- Aluminum Alloys Composites Properties
- Material Properties and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced materials and composites
- High-Temperature Coating Behaviors
- Analytical Chemistry and Sensors
- Copper-based nanomaterials and applications
- Surface Treatment and Coatings
- Catalysis and Hydrodesulfurization Studies
- Concrete Corrosion and Durability
- Extraction and Separation Processes
- Ionic liquids properties and applications
- Solar Thermal and Photovoltaic Systems
Center for Physical Sciences and Technology
2012-2014
Institute of Chemistry
1999-2010
Cr–SiC composite coatings were plated in Cr(VI) baths containing SiC green powder. Analysis of has demonstrated a relatively low percentage (about 0·1–0·9 wt-%) the particles incorporated into Cr coating. XPS data suggest that surface was covered with layer SiO2 formed as result oxidation bath. The corrosion behaviour an acidic sulphate solution studied by potentiodynamic polarisation and electrochemical impedance spectroscopy techniques. Impedance spectra recorded at different times...
To study the electrodeposition of Cr–Co alloy, as a possible alternative to deposition pure Cr, in particular from hexavalent Cr baths, Cr(III) formate–urea electrolyte containing various concentrations CoCl2 was used. The rate, composition, phase state and structure deposits were investigated. data obtained suggest that alloy occurs under acceleration inhibition Co(II) ions electroreductions. It found presence 1–2 g L–1 bath has an optimum effect on good quality thick (30 μm) obtained....
CrNi alloy coatings with various concentrations of Cr and Ni were deposited from trivalent chromium plating baths containing bivalent nickel glycine or oxalate as a complexing agent. The deposition rate, composition morphology chemistry the solutions employed have been studied. It has found that substrate surface initially was coated layer Ni, which facilitates underpotential nucleation on giving an alloy. formation rich starts at less negative potential in bath compared to bath. are...
AbstractAbstractChromium coatings were electrodeposited from trivalent chromium electrolytes with optimised additions of complexing agents to produce a good decorative appearance. The effect hydrazine and hydroxylaminophosphate on the corrosion behaviour Cr deposited Cr(III) formate-urea electrolyte has been studied. was studied through modelling EIS spectra, recorded at different times exposure an acidic sulphate solution (pH 2·6), using various equivalent circuit models. parameters...
SUMMARYProtective properties of Cr coatings electrodeposited in (VI) baths containing mixtures non-conductive dispersed WC and SiC particles were studied by the potentiostatic polarisation impedance spectroscopy methods. The data obtained compared with results tests corrosion chamber. effect these carbides on microstructure a high temperature resistance has been discussed. have shown that, spite low concentration matrix, Cr-WC-SiC exhibited higher to both hot oxidation corrosion, which may...
AbstractAbstractCr–WC–SiC coatings were deposited from Cr(VI) baths containing a mixture of both WC and SiC particles in the ratio 1 : 1. X-ray photoelectron spectroscopy data indicated relatively low percentages (about 2˙68–2˙85 at.-% W4f) (0˙16–0˙45 Si2p) top layers Cr–WC–SiC coatings. However, these have some effect on morphology corrosion properties Cr coating. Protective obtained studied at different exposure times samples sulphate solution (pH=2˙8), using electrochemical impedance...
Black chromium coatings were deposited on a steel substrate from the Cr(III) electrolyte containing ZnO as second main component. The changes in physical and optical properties of sample owing to thermal degradation examined by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoelectron spectroscopy (XPS), scanning (SEM) spectrophotometry. annealed at temperature 600 °C nitrogen atmosphere for 2 hours study influence annealing structural, chemical black chromium. It has...
Black Cr–Zn–P coatings were electrodeposited on a steel substrate from trivalent chromium bath using glycine as complexing agent, ZnO second main component and sodium dihydro-phosphate source of phosphorus. Scanning electron microscopy (SEM), X-ray diffractometry (XRD), photoelectron spectroscopy (XPS) spectral reflectance in the UV–visible–near IR medium ranges used to characterize black coating before after annealing. The relationship between microstructure optical properties deposited has...