INFLUENCE OF THE ZINC GALVANIZING ON FASTENERS CRACKING

1,2 SZŁAPA Ilona
Co-authors:
2 JĘDRZEJCZYK Dariusz 2 SKOTNICKI Wojciech
Institutions:
1 F.Ś. BISPOL S.A. Bielsko-Biała, Poland, EU, iszlapa@bispol.com.pl
2 University of Bielsko-Biala, Bielsko-Biała, Poland, EU, djedrzejczyk@ath.bielsko.pl; wskotnicki@ath.bielsko.pl
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
928-933
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
108 views / 65 downloads
Abstract

In the paper reasons of damage of zinc galvanized screws M12x130 grade 12.9 were analysed. Examinations concerned analysis of fractures created as a result of screws cracking, the verification of structure correctness achieved after the heat treatment, hardness measurement at the screws cross section as well as inspections of the hydrogen content. Based on conducted examinations it was stated that the main reason of analysed screws cracking was steel hydriding - hydrogen brittleness which could take place on individual stages of the production process. Measured hydrogen content much more exceeds the acceptable values, and observed fractures are characteristic of brittle cracking.

Keywords: Zinc coatings, galvanizing, hydrogen brittleness, brittle cracking

© 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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