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CHROMATE-FREE COATINGS FOR CORROSION PROTECTION OF THE SURFACE OF THE ELECTRODEPOSITED ZN-NI ALLOY

1 ABRASHOV Aleksey
Co-authors:
1 ADUDIN Igor’ 1 GRIGORYAN Nelya 1 ORLOVA Kseniya 2 Grafov Oleg 1 VAGRAMYAN Tigran 1 SHEPELEVA Aleksandra
Institutions:
1 MUCTR - D.Mendeleev University of Chemical Technology of Russia, Moscow, Russia, abr-aleksey@yandex.ru
2 IPCE RAS - A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russian Federation, Russia, grafov.oleg88@gmail.com
Conference:
30th Anniversary International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 26 - 28, 2021
Proceedings:
Proceedings 30th Anniversary International Conference on Metallurgy and Materials
Pages:
783-789
ISBN:
978-80-87294-99-4
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2021.4183
Published:
15th September 2021
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
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Abstract

In this work, the processes of applying protective conversion coatings based on rare-earth metal compounds for passivation of the surface of a Zn-Ni alloy were investigated. The mechanism of formation, composition and corrosion characteristics of passivating films were investigated. It is shown that the investigated chromate-free coatings are comparable to rainbow chromate layers in corrosion resistance and protective ability. It was found that these coatings withstand thermal shock without deterioration of functional characteristics. It has been revealed that cerium-, lanthanum-containing coatings, like chromate coatings, have the ability to self-heal.

Keywords: Corrosion protection, conversion coatings, cerium-containing coatings, lanthanum-containing coatings, surface treatment, chromate-free passivation

© 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.

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