DEVELOPMENT OF CHROMATE-FREE PASSIVATION PROCESSES FOR GALVANIZED STEEL

1 ABRASHOV Aleksey
Co-authors:
2 ZHELUDKOVA Ekaterina 3 GRIGORYAN Nelya 4 VAGRAMYAN Tigran 5 MEN’SHIKOV Vladimir
Institutions:
1 MUCTR - D.Mendeleev University of Chemical Technology of Russia, Moscow, Russia, RU, abr-aleksey@yandex.ru
2 MUCTR - D.Mendeleev University of Chemical Technology of Russia, Moscow, Russia, RU, ilyakhinaa@mail.ru
3 MUCTR - D.Mendeleev University of Chemical Technology of Russia, Moscow, Russia, RU, ngrig108@mail.ru
4 MUCTR - D.Mendeleev University of Chemical Technology of Russia, Moscow, Russia, RU, vagramyan@muctr.ru
5 MUCTR - D.Mendeleev University of Chemical Technology of Russia, Moscow, Russia, RU, vm_uti@muctr.ru
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1182-1187
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
15 views / 10 downloads
Abstract

In recent years, nano-sized cerium and silicon-containing coatings have been increasingly used as alternatives to chromate layers on galvanized steel. The present work is devoted to the development of the technology for obtaining these coatings. The processes of applying cerium and silicon-containing coatings to galvanized steel have been developed. The solution for the application of cerium-containing coatings contains in its composition: 10-25 g/l Ce(NO3)3•6H2O; 15-25 ml/l H2O2, 0.5-2 g/l PEG 1500.Solution for the deposition of silicon-containing coatings contains: 25-35 g/l Na2SiO3•5H2O; 20-30 ml/l H2O2, 0.2-0.5 g/l oxyethylenediphosphonic acid (OEDP).It is established that the developed passivation coatings applied on galvanized steel parts for corrosion resistance and protective ability are comparable with chromate coatings. It has been revealed that cerium-containing coatings, like chromate coatings, have the ability to self-heal. It was revealed that, unlike chromate coatings, the developed cerium and silicon-containing coatings withstand the thermal shock without degrading of characteristics. It was established that the thickness of cerium-containing coatings is about 65 nm, and that of silicon-containing coatings is about 50 nm. It should be specially noted that the thickness of these coatings is noticeably less than the thickness of the chromate layers (200-1000 nm).

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