Effect of Mg on the Formation of Periodic Layered Structure during Double Batch Hot Dip Process in Zn-Al Bath

The article presents the results of studies on the influence of Mg on the formation of the periodic layered structure of the Zn-AlMg coatings. These coatings were produced by the double batch hot dip method in a Zn bath and then in a Zn-Al(Mg) bath with a content of 15, 23, 31 wt.% Al and 3, 6 wt.%...

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Bibliographic Details
Published in:Materials 2021-03, Vol.14 (5), p.1259
Main Authors: Saternus, Mariola, Kania, Henryk
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Corrosion resistance
Dip coatings
Hot dip aluminizing
Magnesium
Morphology
Phase composition
Scanning electron microscopy
Steel products
Transition layers
Zinc
Zinc coatings
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Summary:The article presents the results of studies on the influence of Mg on the formation of the periodic layered structure of the Zn-AlMg coatings. These coatings were produced by the double batch hot dip method in a Zn bath and then in a Zn-Al(Mg) bath with a content of 15, 23, 31 wt.% Al and 3, 6 wt.% Mg. The microstructure of the coatings (OM, SEM) was revealed and the phase composition (XRD) obtained in two-component Zn-Al baths and Zn-AlMg baths were determined. The periodic layered structure was found to consist of alternating FeAl phase layers and a bath alloy (Zn + Al + Mg). Moreover, it was observed that the addition of 3 wt.% Mg reduces the thickness of the coating in baths containing 23 and 31 wt.% Al. However, the addition of 6 wt.% Mg causes complete disappearance of periodic layered structure in a bath with 23 wt.% Al. In a bath with a content of 31 wt.% Al the addition of 6 wt.% Mg creates a compact layer consisting of the FeAl phase containing the precipitation of the MgZn phase and Fe Al phase. Such a structure of the coating transition layer limits the growth of the periodic layered structure in the coating.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14051259