CRACK FORMATION DURING HOT-DIP ZN COATING DEFORMATION

1 GONDEK Ján
Co-authors:
1 BABINEC Martin 1 ŠUMEC Martin 1 GOGOLA Peter 2 SUAREZ Lucia 1 KUSÝ Martin
Institutions:
1 Slovak University of Technology, Faculty of Materials Science and Technology
2 Institute of Materials Science, J. Bottu 25, 917 24 Trnava, Slovakia, EU, jan.gondek@stuba.sk, martin.babinec11@gmail.com, martin.kusy@stuba.sk
2 Bekaert Technology Centre(BTC), NV Bekaert SA, Zwevegem, Belgium
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1448-1454
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
21 views / 4 downloads
Abstract

Zn-based alloys are widely used mainly as a protective coating in corrosive environments. Therefore, their research is mainly focused on their corrosion resistance properties and less effort is devoted to the study of mechanical properties, particularly to potential defects under mechanical load in certain applications.The aim of this paper is to characterize the cracking behaviour of three coatings: Zn, Zn5Al and Zn5Al0.5Mg on a steel substrate before and after plastic deformation. This behaviour has been studied by observation of cracks occurred on the surface and on the longitudinal section after bending in various angles (0°, 5°, 10°, 15°, 30°, 60°, 90° and 180°). Metallographic sections were prepared by conventional metallographic procedures and cracks were observed by laser scanning confocal microscopy (LSCM).Higher bending angles and more complex chemical composition led to formation of higher number and density of cracks, especially in case of alloy system containing Mg. With higher bending angles cracks transformed from interface, confined and surface cracks to through cracks. However, this type of crack exposes the substrate to the environment. Coatings after plastic deformation showed significantly improved cracking behaviour.

Keywords: Zn-based alloys, crack, plastic deformation
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