Mechanism of the Hydrogen Cracking of Metals and Alloys, Part I (Review)

Sergeev, N. N.; Sergeev, A. N.; Кутепов, С. Н.; Колмаков, А. Г.; Гвоздев, А. Е.

doi:10.1134/s207511331901026x

Cited by 7 publications

(3 citation statements)

References 52 publications

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“…The background was subtracted from S(E) and the data was converted from arbitrary units to counts by recognizing that the intensity and error bars obtained from Mslice are An and A √ n, where n is counts and A is an arbitrary scaling factor. After these corrections, S(E) was converted to the vibrational density of state g(E) by removing the elastic scattering peak and multi-phonon contributions in the program isdos10 29 , similar to the approach used in Ref. 9 .…”

Section: Inelastic Neutron Scatteringmentioning

confidence: 99%

Transition from Crystal-like to Amorphous-like Heat Conduction in Structurally-Complex Crystals

Hanus¹,

George²,

Wood³

et al. 2020

Preprint

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<pre>The physics of heat conduction puts practical </pre><pre>limits on many technological fields such as </pre><pre>energy production, storage, and conversion, as</pre><pre>well as high-power and high-frequency </pre><pre>electronics. Heat conduction in simple, </pre><pre>defect-free crystals is generally well </pre><pre>understood and seems to be well described by </pre><pre>the phonon-gas model (PGM), where phonon </pre><pre>wave-packets are viewed as heat carrying</pre><pre>particles which propagate their mean free </pre><pre>path before being scattered. It is widely</pre><pre>appreciated that the PGM does not describe </pre><pre>the full vibrational spectrum in amorphous </pre><pre>materials, since this picture likely breaks </pre><pre>down at higher frequencies. Furthermore, it </pre><pre>has been shown that the PGM also breaks down </pre><pre>in certain defective and anharmonic crystals,</pre><pre>not only in the amorphous limit. In this work, </pre><pre>in an attempt to bridge our understanding </pre><pre>between crystal-like (described by the PGM)</pre><pre>and amorphous-like heat conduction, we study </pre><pre>structurally-complex crystalline YB14(Mn,Mg)SB11 </pre><pre>experimentally using inelastic neutron </pre><pre>scattering and computationally using a </pre><pre>two-channel lattice dynamical approach. </pre><pre>One channel is the commonly considered PGM, </pre><pre>and the second we call the diffuson-channel </pre><pre>since it is mathematically the same mechanism </pre><pre>through which diffusons were defined. Our </pre><pre>results show that the diffuson-channel </pre><pre>dominates in YB14MnSb11 above 300 K, which is </pre><pre>a champion thermoelectric material above 800 K. </pre><pre>We demonstrate a method for the rational </pre><pre>design of amorphous-like heat conduction by </pre><pre>considering the energetic proximity phonon modes </pre><pre>and modifying them through chemical means.</pre>

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Section: Inelastic Neutron Scatteringmentioning

confidence: 99%

Transition from Crystal-like to Amorphous-like Heat Conduction in Structurally-Complex Crystals

Hanus¹,

George²,

Wood³

et al. 2020

Preprint

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“…Moreover, in some cases, it is believed that the initial stage of the formation of a corrosion-stressed crack is the development of local corrosion damage (pitting) [ 4 ]. Moreover, it is believed that in the range of steel corrosion potentials (i.e., in the absence of electrochemical protection (ECP) or in the case of its low efficiency), the occurrence and growth of cracks is initiated either by active anodic dissolution of steel at the crack tip [ 5 ], which usually occurs in the course of pitting development, or a decrease in the strength of the metal at the crack tip due to the penetration of electrolytic hydrogen into the metal (hydrogen embrittlement is the limiting case [ 6 ]).…”

Section: Introductionmentioning

confidence: 99%

Specifics and Methods of Inhibiting the Underfilm Corrosion of Carbon Steel

Petrunin,

Yurasova,

Rybkina

et al. 2024

Polymers

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The process of metal dissolution under a delaminated insulating polymer coating (underfilm dissolution) has been studied. For this purpose, we used an experimental setup that simulates the process of corrosion of underground metal structures in the presence of through defects in the polymer coating and/or extended areas of peeling of the polymer coating from the metal (loss of adhesion)—subfilm cavities partially or completely filled with electrolyte. In particular, the distribution of the protective current under a peeled polymer coating was studied, and a sharp decrease in the value of the protective current was shown at a distance of 1–3 cm from the edge of the defect with a gap between the metal and the coating of 1–6 mm. The localized nature of metal corrosion under the exfoliated polymeric coating has been demonstrated. The ratio of the areas with accelerated corrosion to the total area of the metal can be 1 to 100. It has been established that there are areas of anodic dissolution of the metal during cathodic polarization of the entire sample with a peeled coating. The activating effect of carbon dioxide and hydrogen sulfide on the corrosion and anodic dissolution of steel under the coating was shown. So, it has been established that the dissolution current flowing from the anodic sections on a surface can increase approximately 10 times in the presence of carbon dioxide and hydrogen sulfide. A synergistic effect of these compounds on the process of localized underfilm corrosion of steel was detected. It has been developed a mechanism for the formation of localized corrosion damage to steel under a delaminated polymeric coating, which can be the nuclei of corrosion cracks upon reaching a certain level of mechanical loads, i.e., stress corrosion cracking (SCC) of carbon steel. Possible manners of inhibiting underfilm dissolution of metals are considered, and a method for pre-treatment of the surface with solutions of organosilanes, which ensures the formation of surface self-assembled polymeric siloxane nanolayers responsible for inhibiting underfilm corrosion of steel, is proposed.

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“…The effect of hydrogen on the mechanical properties of steel has been extensively reported in the literature [11,12,13,14,15]. Hydrogeninduced wear is a process most often caused by the following [16]:…”

Section: Introductionmentioning

confidence: 99%

Wear Processes of Abrasion-Resistant Materials in Soil Environments of Varying pH

Lemecha¹,

Napiórkowski²,

Ligier³

2023

Adv. Sci. Technol. Res. J.

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The paper evaluates the effect of the value of the negative logarithm of the hydrogen ion concentration in solution, denoted as pH, on the wear of materials used for elements working in the soil mass. Three types of materials with different chemical composition and manufacturing technology were analyzed. The study was carried out under laboratory conditions using the "spinning bowl" method. Low-alloy martensitic steel, boron-containing wearresistant steel, and Fe-Cr-Mn-containing surfacing applied to martensitic steel were tested. Soil pH was found to have a significant effect on the wear pattern of the materials tested. The greatest wear was found in acidic soils with a pH lower than 5, and it was 30-40% greater, depending on the type of material, with respect to soil with a pH above 6.8. The greatest destructive effect was found for low-alloy martensitic steel containing "promoters" of hydrogen penetration. The ways in which the surface is used depending on the pH of the treated soil are described. Hydrogen wear is revealed by decohesion due to weakening of the structural bond of the material. The stages of the process of destructive hydrogen action are defined.

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Mechanism of the Hydrogen Cracking of Metals and Alloys, Part I (Review)

Cited by 7 publications

References 52 publications

Transition from Crystal-like to Amorphous-like Heat Conduction in Structurally-Complex Crystals

Transition from Crystal-like to Amorphous-like Heat Conduction in Structurally-Complex Crystals

Specifics and Methods of Inhibiting the Underfilm Corrosion of Carbon Steel

Wear Processes of Abrasion-Resistant Materials in Soil Environments of Varying pH

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