scholarly journals Hydrogen Embrittlement for High Strength Steel Treated with Zinc and Zinc-Nickel Alloy Electroplating from a Sulfate Bath and Hydrogen Permeability

2019 ◽  
Vol 70 (2) ◽  
pp. 110-114 ◽  
Author(s):  
Makoto HINO ◽  
Yuto IMAMURA ◽  
Tessei IMAIDA ◽  
Hayate ISHII ◽  
Hideaki ASASHITA ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Nickel Alloy ◽  
High Strength Steel ◽  
Hydrogen Permeability ◽  
High Strength ◽  
Sulfate Bath ◽  
Zinc Nickel

Inferences of Baking Time on Hydrogen Embrittlement for High Strength Steel Treated with Various Zinc Based Electroplating

2021 ◽  
Vol 1016 ◽  
pp. 156-161
Author(s):  
Makoto Hino ◽  
Shunsuke Mukai ◽  
Takehiro Shimada ◽  
Koki Okada ◽  
Keitaro Horikawa
Keyword(s):  
Hydrogen Embrittlement ◽  
High Strength Steel ◽  
High Strength ◽  
Film Structure ◽  
Bending Test ◽  
Hydrogen Incorporation ◽  
Three Point Bending ◽  
Vacancy Clusters ◽  
Hydrogen Vacancy ◽  
Zinc Nickel

The hydrogen embrittlement of SK85 high-strength steel sheets was evaluated using a three-point bending test. The effect of electroplating the metal with zinc-based coatings on hydrogen embrittlement was examined by baking treatment of differently electroplated steel specimens. After electroplating, all the specimens underwent hydrogen embrittlement, promoted by hydrogen incorporation into the metal frame, owing to the reduction of hydrogen ions during electroplating. The hydrogen embrittlement of both zinc-and zinc-SiO2-electroplated SK85 steel continued after baking for 24 hours at 473 K, but that of zinc-nickel-and zinc-nickel-SiO2-electroplated SK85 steel ceased. Furthermore, TDA revealed that the trapped hydrogen could be released from steel at approximately 473 K. However, after baking, hydrogen embrittlement did not completely disappear, and we suggest that the formation of hydrogen vacancy clusters also accounts for this fracture phenomenon. The hydrogen incorporated into steel during electroplating led to the formation of hydrogen vacancy clusters, which allowed the formation of embrittlement. However, zinc and zinc-SiO2 films were not permeable enough to release these voids; while the peculiar zinc–nickel and zinc-nickel-SiO2 film structure enabled the hydrogen vacancy clusters to diffuse from the substrate.

scholarly journals Effect of Baking on Hydrogen Embrittlement for High Strength Steel Treated with Various Zinc Based Electroplating from a Sulfate Bath

2020 ◽  
Vol 61 (12) ◽  
pp. 2302-2306
Author(s):  
Makoto Hino ◽  
Shunsuke Mukai ◽  
Takehiro Shimada ◽  
Koki Okada ◽  
Keitaro Horikawa
Keyword(s):  
Hydrogen Embrittlement ◽  
High Strength Steel ◽  
High Strength ◽  
Sulfate Bath

Corrosion Behavior of Low Nickel Alloy High Strength Steel in Seawater Containing Sulfate-Reducing Bacteria

2011 ◽  
Vol 368-373 ◽  
pp. 42-47
Author(s):  
Fu Shao Li ◽  
Mao Zhong An ◽  
Dong Xia Duan
Keyword(s):  
Nickel Alloy ◽  
High Strength Steel ◽  
Culture Medium ◽  
Electrochemical Impedance ◽  
High Strength ◽  
Sulfate Reducing Bacteria ◽  
Iron Sulfides ◽  
Active Dissolution ◽  
Sulfate Reducing ◽  
Reducing Bacteria

Corrosion behaviors of low nickel alloy high strength steel (LNAHSS) was studied by electrochemical impedance spectroscopy and scanning electron microscopy when the coupons of LNAHSS were exposed to the seawater culture media. As the results, LNAHSS was uniformly corroded in the fresh sterilized culture medium in a mode of active dissolution; in the culture medium with sulfate-reducing bacteria (SRB), LNAHSS was protected by the iron sulfides layer to some extent in the early stage of exposure, but severely localized corrosion subsequently occurred resulting from the localized breakdown of iron sulfides layer. So, in risks estimation, special precautions should be taken when LNAHSS serves in the environments containing SRB as the localized area can become the tress raiser.

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