Journal
SURFACE ENGINEERING
Volume 35, Issue 12, Pages 1070-1080Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670844.2018.1564475
Keywords
Ni-P-TiO2 nanocomposite coatings; Ni3Ti intermetallic; DC electrodeposition; mechanical properties; corrosion behaviour
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Ni-P-TiO2 nanocomposite coatings were electrodeposited on copper substrates and influence of TiO2 nanoparticles concentration on the phase structure, morphology, chemical composition, microhardness, and corrosion behaviour of the coatings was investigated. Results demonstrate that Ni3Ti intermetallics form and grow during the electrodeposition of the coatings. This study is the first to report the formation of the intermetallics in the case of electrodeposited Ni-P alloy matrix composite coatings. Moreover, the formation mechanism of the intermetallics is discussed in detail. The formed intermetallics dispersed uniformly throughout the microstructure of the nanocomposite coatings, thereby playing a critical role in improving the mechanical and corrosion-related properties of the coatings. Ni-P-10 g center dot L-1 TiO2 nanocomposite coating possessing the highest amount of Ni3Ti intermetallic associated with the lowest P content, thereby showing the superior microhardness and corrosion resistance. All in all, the volume fraction of Ni3Ti intermetallics is the dominant factor altering the various properties of the coatings.
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