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Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

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2300-1909
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Microstructure and Properties of Ni and Ni/Al2O3 Coatings Electrodeposited at Various Current Densities

A. Góral
  • Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Krakow, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ K. Berent
  • AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, Al. Mickiewicza 30., 30-059 Krakow, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ M. Nowak
  • Institute of Non-Ferrous Meta ls Gliwice, Light Metals Division Skawina, 19 Pilsudskiego Str., 32-050 Skawina, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ B. Kania
  • Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str., 30-059 Krakow, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-03-23 | DOI: https://doi.org/10.1515/amm-2016-0001

The study presents investigations of an influence of various direct current densities on microstructure, residual stresses, texture, microhardness and corrosion resistance of the nickel coatings electrodeposited from modified Watt’s baths. The properties of obtained coatings were compared to the nano-crystalline composite Ni/Al2O3 coatings prepared under the same plating conditions. The similarities and differences of the obtained coatings microstructures visible on both their surfaces and cross sections and determined properties were presented. The differences in the growth character of the Ni matrix and in the microstructural properties were observed. All electrodeposited Ni and Ni/Al2O3 coatings were compact and well adhering to the steel substrates. The thickness and the microhardness of the Ni and Ni/Al2O3 deposits increased significantly with the current density in the range 2 - 6 A/dm2. Residual stresses are tensile and they reduced as the current density increased. The composite coatings revealed better protection from the corrosion of steel substrate than pure nickel in solution 1 M NaCl.

Keywords: Ni coating; Ni/Al2O3 composite coating; microstructure; corrosion resistance

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About the article

Received: 2015-01-20

Published Online: 2016-03-23

Published in Print: 2016-03-01


Citation Information: Archives of Metallurgy and Materials, ISSN (Online) 2300-1909, DOI: https://doi.org/10.1515/amm-2016-0001.

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