Corrosion and Electrochemical Characteristics of the Metal Surfaces (Nitrided in Glow Discharge) in Model Acid Media

Stechyshyn, M. S.; Stechyshyna, N. M.; Kurskoi, Volodymyr

doi:10.1007/s11003-018-0129-8

Cited by 12 publications

(7 citation statements)

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“…Thus, according to [11], for parts that are operated in corrosive environments and for wear at low contact voltages, the BATR should be carried out at the maximum possible voltage and current density, which contributes to the formation of a phase and, accordingly, we have a high corrosion resistance, as well as good running-in of friction surfaces. In this case, in order to avoid the transition of a glow discharge to an electrospark one, the condition w < wKR should be observed, i.e.…”

Section: Research Results and Their Discussionmentioning

confidence: 99%

“…However, this is not the main advantage of nitriding, but the main factor is the physicochemical properties of the hardened layers, which provide the specified performance characteristics of the hardened surfaces of parts. So, in works [6,7,11,12] doubts are expressed about the legitimacy of the use of specific power as the only energy criterion due to the possibility of arbitrary combination of its values with different values of voltage and current density at a constant pressure of the gas mixture. The studies given by us have shown that it is more expedient to assess the changes in voltage and current density.…”

Section: Research Results and Their Discussionmentioning

confidence: 99%

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Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Stechishina¹,

Стечишин²,

Martynyuk³

et al. 2021

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One of the modern and effective methods of hardening metals is nitriding in a glow discharge in ammonia or in an anhydrous medium (nitrogen + argon) - BATR. This paper presents the results of experimental studies comparing the results of tribological and physicochemical properties of hardened surfaces obtained by nitriding with autonomous and interconnected BATR modes. The complex of traditionally fixed values of operating parameters (temperature, composition of the gas mixture, pressure and saturation time) without taking into account energy characteristics (voltage, current density and specific discharge power) significantly reduces the technological capabilities of BATR to achieve the necessary physicochemical properties of metal surfaces specified by conditions exploitation. Taking into account the energy characteristics of BATR, a significant reduction in the energy consumption of the nitriding process is achieved. The energy levels of the main subprocesses are significantly different: the formation of nitrides occurs at low energies, surface sputtering occurs at high voltage values, and nitrogen diffusion occurs at increased current density values. In cases where the energy of the flow is insufficient, either a glow discharge may not occur at all, or with a lack of voltage, the nitride ball on the surface is not sprayed and it acts as a barrier that prevents the diffusion process into the inner layers of the metal, which leads to low physicochemical and, correspondingly, tribological indicators of nitrided balls. The quantitative ratio between them and the required operational properties of the metal, respectively, can be achieved only through an independent combination of the energy and operating characteristics of BATR

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Section: Research Results and Their Discussionmentioning

confidence: 99%

Section: Research Results and Their Discussionmentioning

confidence: 99%

Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Stechishina¹,

Стечишин²,

Martynyuk³

et al. 2021

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“…Under corrosion-mechanical wear (CMW), whose subtype is represented by cavitation-erosion wear (CEW) of metals in corrosive media, the corrosion component of destruction is insignificant by itself. However, as it is a catalyst for electrochemical processes, it significantly affects the general characteristics of metal surface destruction [1]. The inertness of most polymeric materials, especially fluoroplastics, with respect to corrosive liquids has resulted in increased interest in the use of such materials for manufacturing products that contact chemically aggressive liquids.…”

Section: Introductionmentioning

confidence: 99%

Cavitation-Erosion Wear Resistance of Fluoroplasticics in Model Food Production Media

et al. 2019

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The effect of acidic, alkaline and neutral media on wear kinetics and mechanism for fluoroplastics and polyolefins has been studied. Equations for fluoroplastic and polyolefin wear intensity are obtained based on the thermochemical and mechanical model of their destruction. The values of the activation energies for the surface destruction onset over the entire wear cycle of the polymer surface spherulite are determined.

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“…Однак не це є основною перевагою, а головно фізико-хімічні властивості зміцнених шарів, які забезпечують задані експлуатаційні показники. Так, висловлюють [7,8] сумніви в правомірності застосування питомої потужності як єдиного енергетичного критерію через можливість довільного комбінування її значень із різними напругами й густинами струму за сталого тиску газової суміші. Дослідження показали, що доцільнішим є оцінювання змін напруги й густини струму.…”

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“…1, режим 9). Відповідно змінюються корозійні [8], втомні характеристики [9], міцності й пластичності [10], залишкові напруження стиску [11] азотованих шарів.…”

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Strength and Plasticity of the Surface Layers of Metals Nitrided in Glow Discharge

Stechyshyn

Stechyshyna

Martynyuk³

et al. 2018

Mater Sci

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Досліджено вплив режимних (температура, склад та тиск газової суміші) і енергетичних характеристик (напруга, густина струму, питома потужність розряду) за безводневого азотування в тліючому розряді (БАТР) на структуру, фазовий склад азотованих шарів. Показано, що завдяки комбінації режимних та енергетичних параметрів БАТР можна досягнути фізико-хімічних показників азотованих шарів заданих умовами експлуатації. Ключові слова: безводневе азотування в тліючому розряді, фазовий склад, напруга, густина струму, питома потужність розряду.The influence of the regime (temperature, composition of a gas mixture and its pressure) and energy characteristics (voltage, current density, specific discharge power) under nonhydrogenated nitriding in a glow discharge (NHGD) on the structure, phase composition of the nitrided layers is investigated. It is shown that because of the combination of regime and energy parameters of the NHGD it is possible to reach the physical and chemical indicators for the nitrided layers assigned by the exploitation conditions.

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Corrosion and Electrochemical Characteristics of the Metal Surfaces (Nitrided in Glow Discharge) in Model Acid Media

Cited by 12 publications

References 1 publication

Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Influence of the parameters of hydrogen nitrogen nitrogen in a glow discharge on tribological and physico-chemical properties of steel 40X

Cavitation-Erosion Wear Resistance of Fluoroplasticics in Model Food Production Media

Strength and Plasticity of the Surface Layers of Metals Nitrided in Glow Discharge

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