Effect Of Cathodic Current Density on Microstructure and Properties of Nickel Composite Coatings

Studies were carried out to characterise the nickel composite coatings deposited on a 2xxx series aluminium alloy. The composite coatings were prepared in a Watts bath with the addition of fine-dispersed particles of Al[2]O[3] powder introduced in an amount of 100 g/l using current densities of 2, 4...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2014-03, Vol.59 (1), p.323-327
Main Authors: Nowak, M, Opyrchal, M, Boczkal, S, Zelechowski, J, Najder, A, Karas, M
Format: Article
Language:English
Subjects:
Aluminum base alloys
Coatings
Composite coatings
Current density
Density
Metallurgy
Nickel
Particulate composites
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Summary:Studies were carried out to characterise the nickel composite coatings deposited on a 2xxx series aluminium alloy. The composite coatings were prepared in a Watts bath with the addition of fine-dispersed particles of Al[2]O[3] powder introduced in an amount of 100 g/l using current densities of 2, 4, 6 and 8 A/dm[2]. The morphology, structure, thickness and microhardness of the obtained composite coatings were described. The volume fraction of Al[2]O[3] particles in composite coating was determined. The corrosion resistance of thus produced coatings was examined. Based on the results of the conducted studies it was stated that all the produced coatings were characterised by good adhesion to the substrate, but coatings produced at high current densities were characterised by a lower content of the Al[2]O[3] reinforcing phase present in the composite.
ISSN:1733-3490
2300-1909
DOI:10.2478/amm-2014-0053