Graphene coating as a protective barrier against hydrogen embrittlement

Nam, Tae-Heum; Lee, Jung-Hun; Choi, Seok-Ryul; Yoo, Ji‐Beom; Kim, Jung-Gu

doi:10.1016/j.ijhydene.2014.05.132

Cited by 50 publications

(20 citation statements)

References 43 publications

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“…We expect that this work will prompt an accelerated search for effective gas additives [32,33] or coatings [34,35] to inhibit the hydrogen-induced embrittlement in these materials, and will also stimulate new experimental attempts to measure the vibrational frequencies with high resolution, by performing state-of-the-art EELS experiments, or non-linear surfacespectroscopic laser experiments at wavenumbers of around 1000 cm −1 and below [36,37].…”

Section: Introductionmentioning

confidence: 99%

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Chohan

Jimenez-Melero

Koehler

2016

Applied Surface Science

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We have computed adsorption energies, vibrational frequencies, surface relaxation and buckling for hydrogen adsorbed on a body-centred-cubic Fe(110) surface as a function of the degree of H coverage. This adsorption system is important in a variety of technological processes such as the hydrogen embrittlement in ferritic steels, which motivated this work, and the Haber-Bosch process. We employed spin-polarised density functional theory to optimise geometries of a six-layer Fe slab, followed by frozen mode finite displacement phonon calculations to compute Fe-H vibrational frequencies. We have found that the quasi-threefold (3f) site is the most stable adsorption site, with adsorption energies of ∼3.0 eV/H for all coverages studied. The long-bridge (lb) site, which is close in energy to the 3f site, is actually a transition state leading to the stable 3f site. The calculated harmonic vibrational frequencies collectively span from 730 to 1220 cm −1 , for a range of coverages. The increased first-to-second layer spacing in the presence of adsorbed hydrogen, and the pronounced buckling observed in the Fe surface layer, may facilitate the diffusion of hydrogen atoms into the bulk, and therefore impact the early stages of hydrogen embrittlement in steels.

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Section: Introductionmentioning

confidence: 99%

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Chohan

Jimenez-Melero

Koehler

2016

Applied Surface Science

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“…Because graphene is highly impermeable to ions and molecules, the interconnected graphene at the grain boundaries acts as a charge transfer inhibitor [36] which impedes the free flow of Cu + ions and H 2 /O 2 across the Cuelectrolyte interface, and thus reducing the surface area exposed to the corrosion solution [31]. Therefore, the formation of the 3DIGN can effectively reduce the reaction speed and CR of the metal matrix, resulting in the excellent corrosion resistance of the 3Di Gr-Cu composite.…”

Section: Electrochemical Corrosion (Ecc)mentioning

confidence: 99%

“…Figure 6(a) illustrates the experimental setup for the HAC tests. During the experiment, a positive potential was applied to the anode (Pt), and hydrogen was generated through electrochemical reactions as follows [36]:…”

Section: Hydrogen-assisted Corrosion (Hac)mentioning

confidence: 99%

Electrochemical Corrosion Resistance and Electrical Conductivity of Three-Dimensionally Interconnected Graphene-Reinforced Cu Composites

Li¹,

Choi²

2021

Korean J. Met. Mater.

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A three-dimensionally interconnected graphene-reinforced Cu (3Di Gr-Cu) composite was synthesized using a simple two-step process technique which involves the mechanical compaction of micronsized Cu particles followed by chemical vapor deposition (CVD) at 995 ℃. The microstructural properties of pure Cu and the 3Di Gr-Cu composite were investigated by optical microscope, scanning electron microscope, and X-ray diffractometer. The electrical and corrosion behaviors of the 3Di Gr-Cu composite and Cu only, prepared by powder metallurgy (PM Cu), were studied and compared. The electrical conductivity (EC) of the 3Di Gr-Cu composites was found to be 38.8 MSm<sup>−1</sup> at a carbon content of 73 ppm, and exhibited a 12% higher EC than the PM Cu. Due to the interconnected graphene around the Cu grains, the corrosion current density and corrosion rate of the 3Di Gr-Cu composite decreased by 29% and 40%, respectively, compared to the PM Cu. The EC of the 3Di Gr-Cu composite depended on the carbon content. The improvement in the EC of the 3Di Gr-Cu composite is attributed to the electron-carrying ability of the three-dimensionally interconnected graphene network (3DIGN) formed at the grain boundaries in the composite. The enhancement in corrosion resistance is due to the impermeability of graphene to various chemical species.

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“…This shos that the higher strains result in defects in graphene layers and reduced resistance towards hydrogen permeability. Jayanta M. and coworkers [75] developed a corrosion resistant composite coating of polypyrrole and graphene oxide for AISI type 304 stainless steel substrates. They used galvanostatic deposition technique for electrodeposition of graphene oxide-polypyrrole composite onto a 304 stainless steel substrate and concluded that this material can be used as an effective corrosion inhibitor.…”

Section: Graphene Based Nano Composite Coatings As Protective Barriermentioning

confidence: 99%

Combating Hydrogen Embrittlement With Graphene Based Coatings

Khare¹,

Vishwakarma²,

Ahmed³

2019

IJARET

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Hydrogen embrittlement (HE) is an epidemic problem for high strength medium carbon low alloy steel causing reduction in mechanical strength and useful service lifetime. Hydrogen embrittlement of high strength steel is concern for various industrial components used in critical applications. Unpredictable & sudden failure of mechanical equipment/components made of high strength steel (HSS) below designed allowable stress and without appreciable deformation resulted in many catastrophic accidents. HSS being used in various engineering applications such as Aerospace, Nuclear, Marine and Transportation etc. Components typically affected by hydrogen embrittlement are pressure vessels, boilers, automobile frame, fasteners & hardware, shafts, axles, rotors, pipelines etc. Extensive research has been done by scientists & engineers to explore various ways to prevent hydrogen embrittlement. Some of them are i) addition of alloying elements ii) selection of material with less susceptibility to hydrogen iii) use of barrier layers to prevent hydrogen diffusion iv) change in manufacturing process and application environment v) use of advance Nano coatings to minimize hydrogen penetration etc. Out of all these methods of controlling hydrogen embrittlement, use of advance coatings appears to be more practical, less intricate and economical. In current decade Graphene has achieved a great attention from engineering world because of its excellent chemical, physical, mechanical & thermal properties. Graphene can act as a protective barrier against many environmental induced degradation of alloy steels because of its extraordinary impermeability. This review article summaries the current state of research & available commercial solutions for mitigations of hydrogen embrittlement using graphene based Nanocoatings. Authors have conducted experiments on several available coatings including graphene to investigate the behavior in an environment promoting hydrogen embrittlement and compared the effect on mechanical properties and ductility of high strength steel (EN24/AISI4340/34CrNiMo6)

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Graphene coating as a protective barrier against hydrogen embrittlement

Cited by 50 publications

References 43 publications

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Surface atomic relaxation and magnetism on hydrogen-adsorbed Fe(110) surfaces from first principles

Electrochemical Corrosion Resistance and Electrical Conductivity of Three-Dimensionally Interconnected Graphene-Reinforced Cu Composites

Combating Hydrogen Embrittlement With Graphene Based Coatings

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