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Ni/nano-TiO2 composite electrodeposits: Textural and structural modifications

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Ni/nano-TiO2 composite electrodeposits: Textural and structural modifications (EN)
Spyrellis, N (EN)
Spanou, S (EN)
Pavlatou, EA (EN)
journalArticle (EN)
2014-03-01T01:31:19Z
2009 (EN)
Nanocomposite coatings were obtained by electrochemical codeposition of TiO2 nano-particles (mean diameter 21 nm) with nickel, from an additive-free Watts type bath. The electrodeposition of Ni-TiO2 composites was carried Out on a rotating disk electrode (RDE), by applying direct current. Pure Ni deposits were also produced under the same experimental conditions for comparison. The surface morphology, the crystallographic orientation of nickel matrix and the grain size of the deposits were investigated, along with the distribution and the percentage, of the embedded nano-particles in nickel matrix, as a function of pH, current density and concentration of TiO2 nano-particles in the bath. The observed textural modifications of composite coatings are associated with specific Structural modifications of Ni crystallites provoked by the adsorption-desorption phenomena occurring oil the metal surface, induced by the presence of TiO2 nano-particles. It has been observed that the presence of TiO2 nano-particles favours the [100] texture of nickel matrix. Moreover, the codeposition of titania nano-particles with nickel was found to be favoured at low pH and low applied Current values. As the titania incorporation percentage is increased, a considerable grain refinement in the nanometer region was revealed followed by an improvement of the quality of the nickel preferred orientation. (C) 2008 Elsevier Ltd. All rights reserved. (EN)
Electrochemistry (EN)
Rotating disks (EN)
Applied currents (EN)
Mean diameters (EN)
Titania (EN)
Rotating disk electrodes (EN)
Adsorption desorptions (EN)
Concentration of (EN)
Crystallographic orientations (EN)
Nanoparticles (EN)
Direct currents (EN)
Composite coating (EN)
Co depositions (EN)
Structural modifications (EN)
Nano-composite coatings (EN)
Electrodeposition (EN)
Nanometer regions (EN)
Titanium dioxide (EN)
Grain refinement (EN)
Grain size and shape (EN)
Nickel alloys (EN)
Nano-particles (EN)
Desorption (EN)
Preferred orientation (EN)
Nickel matrixes (EN)
Watts type baths (EN)
Titanium oxides (EN)
Experimental conditions (EN)
Adsorption (EN)
Metal surfaces (EN)
Composite coatings (EN)
Nickel deposits (EN)
Grain sizes (EN)
Nickel electrodeposition (EN)
Electrochemical codeposition (EN)
Nickel (EN)
Alumina (EN)
Textural modifications (EN)
Electrochimica Acta (EN)
English
PERGAMON-ELSEVIER SCIENCE LTD (EN)
National Technical University of Athens
Digital Library of National Technical University of Athens | Dspace@NTUA
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά



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