Surface quality of the Ni-TiO2 composite coatings produced by electroplating
Composite nickel coatings on a brass substrate were produced from suspensions consisted of a conventional nickel sulphate bath and fine TiO2 particles (dp < 0.35 μm). Characterization of coatings surface was performed by using optical and SEM micrographs, by EDS analysis and by determini...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2017-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700042S.pdf |
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| Summary: | Composite nickel coatings on a brass substrate were produced from suspensions
consisted of a conventional nickel sulphate bath and fine TiO2 particles (dp
< 0.35 μm). Characterization of coatings surface was performed by using
optical and SEM micrographs, by EDS analysis and by determining the surface
roughness parameters. Metallographic analysis has also been done in order to
get an insight about particles distribution throughout the thickness of the
coating layer. Presence of TiO2 particles in electrodeposited metal affected
the surface morphology. Particles were embedded as smaller or bigger
agglomerates within the coatings, as well as the individual particles.
Metallographic analysis showed uniform distribution of particles and their
agglomerates within the coating. Surface roughness parameters of the
composites have had up to 35 times higher values than the ones of the pure
nickel coatings. Roughness maxima appeared at the concentration of particles
between 10 and 20 g dm-3. Then it drops down and remains constant for
concentrations > 40 gdm-3. SEM micrographs showed irregularities like
single-nodule, or beads of nodules on the surface. Relationship between
surface roughness and current density has not been noted. [Project of the
Serbian Ministry of Education, Science and Technological Development, Grant
no. OI 172060] |
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| ISSN: | 1450-5339 2217-7175 |