Low-temperature carburized high-alloyed austenitic stainless steels in PEMFC cathodic environment

Maistro, Giulio; Kante, Stefan; Nyborg, Lars; Cao, Yu

doi:10.1016/j.surfin.2021.101093

Cited by 14 publications

(4 citation statements)

References 50 publications

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“…The concentrated energy flows (CEF) technologies such as sputtering [25][26][27] and plasma processing [28,29]), laser processing [30][31][32], allow to radically change the surface properties of machine parts. Among the CEF technologies, the electrospark alloying (ESA) process has several unique capabilities due to which it is possible to create special surface structures with high physical, mechanical and tribological properties at the nano-level [33].…”

Section: Introductionmentioning

confidence: 99%

The Formation of C-S Coatings by Electrospark Alloying with the Use Special Process Media

Haponova,

Tarelnyk,

Tarelnyk

et al. 2024

SSP

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The paper presents an analysis of technologies for improving the quality parameters of the surface layers of parts, which were carried out by the method of electrospark alloying (ESA) and by additional saturation of surfaces with alloying elements from special process media (STM). The technology of sulfocementation was considered. Metallographic and hardness tests after sulfocementation by ESA showed that the treated surface consists of layers: "soft", hardened and base metal. As the discharge energy increases, the thickness, microhardness and integrity of the coating increase. The presence of sulfur in STM promotes the sulfidation process. It is shown that sulfur accumulates on the surface of the metal at a depth of up to 30 μm. This zone is characterized by reduced microhardness. A strengthened layer is formed under this layer, it has an increased carbon content and high microhardness.

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Section: Introductionmentioning

confidence: 99%

The Formation of C-S Coatings by Electrospark Alloying with the Use Special Process Media

Haponova,

Tarelnyk,

Tarelnyk

et al. 2024

SSP

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“…Low-temperature carburizing of stainless-steel materials using carburizing gases, such as methane, propane, and butane, is a common method for producing a carburizing S phase with supersaturated carbon. In this method, carbon diffuses from the surface to form an expanded austenitic phase, thus improving wear resistance similar to the nitriding S phase [30][31][32][33][34][35][36][37]. Furthermore, compared to only carburizing or nitriding, a continuous or simultaneous treatment that combines carburizing and nitriding can increase the thickness, hardness, and wear resistance of the S phase [38][39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Effects of Solid-Solution Carbon and Eutectic Carbides in AISI 316L Steel-Based Tungsten Carbide Composites on Plasma Carburizing and Nitriding

Adachi

Yamaguchi

Tanaka

et al. 2023

Metals

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AISI 316L stainless-steel-based tungsten carbide composite layers fabricated via laser metal deposition are used for additive manufacturing. Heat treatment practices such as low-temperature plasma carburizing and nitriding improve the hardness and corrosion resistance of austenitic stainless steels via the formation of expanded austenite, known as the S phase. In the present study, practices to enhance the hardness and corrosion resistances of the stainless-steel parts in the composite layers have been investigated, including single plasma carburizing for 4 h and continuous plasma nitriding for 3.5 h following carburizing for 0.5 h at 400 and 450 °C. The as-deposited composite layers contain solid-solution carbon and eutectic carbides owing to the thermal decomposition of tungsten carbide during the laser metal deposition. The eutectic carbides inhibit carbon diffusion, whereas the original solid-solution carbon contributes to the formation of the S phase, resulting in a thick S phase layer. Both the single carburizing and continuous processes are effective in improving the Vickers surface hardness and corrosion resistance of the composite layers despite containing the solid-solution carbon and eutectic carbides.

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“…Nevertheless, the passivation of stainless steel will cause its surface conductivity and wettability to decrease significantly, which cannot meet the application requirements. Therefore, surface modification is necessary before stainless steel is used as bipolar plates [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Properties of SS304 Modified by Nickel–Cobalt Alloy Coating with Cauliflower-Shaped Micro/Nano Structures in Simulated PEMFC Cathode Environment

Xuan

Liu

et al. 2022

Nanomaterials

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This study presents the corrosion behavior and surface properties of SS304 modified by electrodeposited nickel–cobalt (Ni–Co) alloy coating with cauliflower-shaped micro/nano structures (Ni–Co/SS304) in the simulated PEMFC cathodic environment. The hydrophobicity of the as-prepared Ni–Co alloy coating can be improved simply by low-temperature annealing. The morphology and composition of the Ni–Co/SS304 were analyzed and characterized by SEM, EDS, XRD, and XPS. The polarization, wettability, and ICR tests were respectively conducted to systemically evaluate the performance of Ni–Co/SS304 in the simulated PEMFC cathode environment. As revealed by the results, the Ni–Co/SS304 can maintain its hydrophobicity under hot-water droplets as high as 80 °C and demonstrates higher conductivity than the bare SS304 substrate before and after polarization (0.6 V vs. SCE, 5 h), which is of great significance to improve the surface hydrophobicity and conductivity of bipolar plates.

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Low-temperature carburized high-alloyed austenitic stainless steels in PEMFC cathodic environment

Cited by 14 publications

References 50 publications

The Formation of C-S Coatings by Electrospark Alloying with the Use Special Process Media

The Formation of C-S Coatings by Electrospark Alloying with the Use Special Process Media

Effects of Solid-Solution Carbon and Eutectic Carbides in AISI 316L Steel-Based Tungsten Carbide Composites on Plasma Carburizing and Nitriding

Properties of SS304 Modified by Nickel–Cobalt Alloy Coating with Cauliflower-Shaped Micro/Nano Structures in Simulated PEMFC Cathode Environment

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