The effect of Zn-Al coating on the hydrogen embrittlement of twinning-induced plasticity steels with and without Al

We investigated the effect of Zn-Al hot-dip galvanizing on the H embrittlement of twinning-induced plasticity steels with and without Al. Both hot-dip galvanized specimens had coating layers consisting of the Al-bearing η-Zn layer and the Fe-Al inhibition layer. Zn-Al hot-dip galvanizing and additio...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-03, Vol.776, p.156-165
Main Authors: Kwon, Hyeok-Jun, Nam, Jae-Hoon, Yu, Sang-Hyun, Lee, Young-Kook
Format: Article
Language:English
Subjects:
Aluminum coatings
Coating effects
Crack propagation
Elongation
Hot dip aluminizing
Hot dip galvanizing
Hydrogen
Hydrogen desorption
Hydrogen embrittlement
Immersion coating
Intermetallic compounds
Intermetallics
Iron
Metal coatings
Protective coatings
Steel
TWIP steels
Zinc
Zinc coatings
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Summary:We investigated the effect of Zn-Al hot-dip galvanizing on the H embrittlement of twinning-induced plasticity steels with and without Al. Both hot-dip galvanized specimens had coating layers consisting of the Al-bearing η-Zn layer and the Fe-Al inhibition layer. Zn-Al hot-dip galvanizing and additional H-charging hardly reduced the elongation. These results are closely related to crack propagation. The H desorption energy values of the matrix, the η-Zn layer, and the inhibition layer were 34.7, 52.6, and 60.8 kJ mol−1, respectively. The inhibition layer revealed the strongest H trapping ability and the highest H concentration. •The Fe-Al inhibition layer was more developed in 2Al_HDG due to the less area of oxidized surface.•The tensile properties of both Zn-Al hot-dip galvanized steels were hardly deteriorated even after hydrogen charging.•The Fe-Al inhibition layer has the highest H concentration and H desorption energy (60.8 kJ mol−1).•Zn-Al hot-dip galvanizing improves the resistances to both corrosion and hydrogen embrittlement.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.10.199