INVESTIGATION OF NI-P COATINGS ON AZ91 CAST MAGNESIUM ALLOY

1 WASSERBAUER Jaromír
Co-authors:
1 BUCHTÍK Martin 1 BRESCHER Roman
Institution:
1 Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Brno, Czech Republic, EU, wasserbauer@fch.vut.cz
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1192-1196
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
54 views / 29 downloads
Abstract

In this paper, the preparation and characterization of as-deposited and heat-treated low phosphorus Ni-P coatings on AZ91 magnesium was performed. Heat-treated Ni-P coatings reached the higher microhardness of 1030 ± 20 HV 0.025 when compared to as-deposited Ni-P coatings (560 ± 20 HV 0.025). Using the scanning electron microscopy, the microstructure and surface morphology of Ni-P coatings was observed. Heat-treated coatings were formed by cracks network on their surface due to their crystallization during the heat-treatment. These cracks negatively affected the electrochemical and corrosion properties. However, as-deposited Ni-P coatings improved the electrochemical corrosion properties when compared to AZ91 alloy. The corrosion potential increased to -0.59 ± 0.02 V and the corrosion current density decreased to 1.4 ± 0.3 µA∙cm-2.

Keywords: Electroless Ni-P coating, AZ91, magnesium alloy, heat treatment, potentiodynamic polarization test

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Scroll to Top