Electrodeposition of nanocrystalline Ni–W coatings strengthened by ultrafine alumina particles
In the present study, the electrodeposition conditions for Ni–W/Al2O3 nano-composite coatings from aqueous electrolyte solutions have been developed with the view of preparing hard protective coatings. The influence of processing parameters (type of alumina powder, current density, ultrasonic field...
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Published in | Surface & coatings technology Vol. 211; pp. 62 - 66 |
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Main Authors | , , , , |
Format | Journal Article Conference Proceeding |
Language | English |
Published |
Amsterdam
Elsevier B.V
25.10.2012
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | In the present study, the electrodeposition conditions for Ni–W/Al2O3 nano-composite coatings from aqueous electrolyte solutions have been developed with the view of preparing hard protective coatings. The influence of processing parameters (type of alumina powder, current density, ultrasonic field frequency) on the metal matrix characteristics and the electrochemical behaviour of the electrode was discussed. The effect of the structure of the nano-dispersive phase on the content and distribution of embedded Al2O3 particles has also been reported. Based on mechanical and microstructural properties of the coatings, the optimum conditions for obtaining the crack-free homogeneous Ni–W/Al2O3 composite coatings have been determined.
► Nanocrystalline Ni–W/Al2O3 composite coatings were DC electrodeposited under ultrasonic field. ► We examine different types of Al2O3 nanopowders. ► Al2O3 structure influences composite composition and properties. ► Lower frequencies of ultrasound essentially improved mechanical performance of composite coatings. |
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ISSN: | 0257-8972 1879-3347 |
DOI: | 10.1016/j.surfcoat.2011.10.021 |