Behavior of hydrogen in aluminum exposed in different atmospheres

Shikagawa, Takahiro; Itoh, Goroh

doi:10.2464/jilm.60.433

Cited by 11 publications

(4 citation statements)

References 10 publications

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“…For the un-treated specimen, the hydrogen release up to 420°C was slight, and the peak from 420°C seemed to correspond to desorption of molecular hydrogen strongly trapped in micropores inside the alloy. 8,9) On the other hand, hydrogen release was observed from all plated specimens, which confirms that hydrogen was taken up by the plating.…”

Section: Hydrogen Analysissupporting

confidence: 53%

Evaluation of Hydrogen Embrittlement of Electroless Ni–P Plated 6061-T6 Aluminum Alloy by Three-Point Bending and Rotating Bending Fatigue Tests

Hino,

Shinno,

Kawaue

et al. 2024

Mater. Trans.

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In this study, 6061-T6 aluminum alloys were plated with electroless Ni-P with different phosphorus content and three-point bending and rotating bending fatigue tests. The effects of hydrogen due to plating on mechanical properties were investigated. It was shown that the ductility decreased immediately after low-phosphorus type and high-phosphorus type Ni-P plating by three-point bending test because a hydrogen was introduced into the alloys. The fatigue strength of the low-phosphorus type Ni-P plated specimen was higher than that of the un-treated specimen, while that of the high-phosphorus type plated specimen was much lower. It is clear that the fatigue strength differs greatly depending on the phosphorus content in the plating film. 6061-T6 aluminum alloy have been reported to exhibit no hydrogen embrittlement in low strain rate tensile tests under wet condition. However, it was found that hydrogen embrittlement occurred when 6061-T6 aluminum alloy was plated with the high-phosphorus type electroless Ni-P and fatigue-tested on rotating bending machine.

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Section: Hydrogen Analysissupporting

confidence: 53%

Evaluation of Hydrogen Embrittlement of Electroless Ni–P Plated 6061-T6 Aluminum Alloy by Three-Point Bending and Rotating Bending Fatigue Tests

Hino,

Shinno,

Kawaue

et al. 2024

Mater. Trans.

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“…The hydrogen release peak beginning at 480°C is thought to correspond to the release of molecular hydrogen, which is strongly trapped in the micropores inside the alloy. 16,17) Note that this peak does not appear for the double-zincated and plated specimens. This may be due to the fact that the displacement-deposited zinc film and NiP-plated film prevented hydrogen release and shifted the peak to a higher temperature above 500°C.…”

Section: Hydrogen Analysismentioning

confidence: 99%

Effect of Electroless Ni–P Plating on Rotary Bending Fatigue Strength of A2017-T4 Aluminum Alloy

et al. 2022

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In this study, A2017-T4 aluminum alloy was plated with electroless NiP with different phosphorus content and rotary bending fatigue test was conducted to investigate the effect of hydrogen by plating on fatigue properties. The fatigue strength of the low-phosphorus type NiP plated specimen was higher than that of the untreated specimen, while that of the high-phosphorus type plated specimen was much lower. It is clear that the fatigue strength differs greatly depending on the phosphorus content in the plating film. The decrease in fatigue strength of the high phosphorus type plating specimen was attributed to hydrogen induced by plating from hydrogen analysis. Thus, despite the previous report that 2000 series aluminum alloys do not exhibit hydrogen embrittlement in slow strain rate tensile tests under wet condition, it was found that A2017-T4 aluminum alloy undergo hydrogen embrittlement when the alloy is plated with high-phosphorus type electroless NiP and fatiguetested on rotary bending machine.

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“…The reason is considered as follows. In (d), adsorbed molecules of water on the surface of the samples will react with aluminum and extrinsic hydrogen will enter the samples [4]. In (a), the oil molecules in the IP chamber will be adsorbed on the surface of the sample.…”

Section: Resultsmentioning

confidence: 99%

Analysis on Behavior of Hydrogen in Ion-Plated Pure Aluminum

Iwahashi

Itoh

Saitoh

et al. 2011

AMR

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An increasing interest has been being taken in hydrogen as a clean energy for solving the global environmental problems. In order to use the hydrogen in safety, investigation on the hydrogen behavior is required. Although hydrogen microprint technique (HMPT) has been known to be effective to investigate the hydrogen behavior, the low detection efficiency for hydrogen was reported. Ion-plating (IP) was reported to increase the detection efficiency in HMPT emitted from the specimen by plastic deformation. On the other hand, no such increase was found for hydrogen permeating through the specimen ion-plated with substrate heating in the previous study by the authors. In the present study, the sheet samples of pure aluminum with 99.99% purity were dehydrogenated and subjected to (a) holding in the IP chamber, (b) bombardment with Ar ions, (c) substrate heating after the bombardment and (d) holding in air. Hydrogen behavior in these samples has been investigated by means of thermal desorption spectroscopy (TDS). The amount of desorbed hydrogen was evidently larger in the conditions of (a) and (b) than in (d). However, the amount of desorbed hydrogen was decreased by the substrate heating (c) to the same level as in (d).

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Behavior of hydrogen in aluminum exposed in different atmospheres

Cited by 11 publications

References 10 publications

Evaluation of Hydrogen Embrittlement of Electroless Ni–P Plated 6061-T6 Aluminum Alloy by Three-Point Bending and Rotating Bending Fatigue Tests

Evaluation of Hydrogen Embrittlement of Electroless Ni–P Plated 6061-T6 Aluminum Alloy by Three-Point Bending and Rotating Bending Fatigue Tests

Effect of Electroless Ni–P Plating on Rotary Bending Fatigue Strength of A2017-T4 Aluminum Alloy

Analysis on Behavior of Hydrogen in Ion-Plated Pure Aluminum

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