Effects of plasma nitriding in the corrosion behavior of an AISI 4140 steel using a seawater medium solution

Valdés, J.; Huape, E.; Oseguera, J.; Ruíz, Alberto; Ibarra, J.; Bernal, J.L.; Medína, A.

doi:10.1016/j.matlet.2022.131991

Cited by 10 publications

(4 citation statements)

References 11 publications

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“…While, the corrosion resistance is only determined by the compound layer because of its high chemical stability in aggressive media. This has been welldocumented in literatures and is also demonstrated in this study by corrosion tests in sodium chloride solution [11][12][13]. Mouri et al utilized plasma treatment to form a nitride layer with a thickness not exceeding 6 μm on the surface of low-alloy steels, which significantly improved their corrosion resistance in a 0.5 mol/l NaCl solution [14] Rao et al subjected low-alloy steels to 500 °C of plasma nitriding for 8-10 h, resulting in the formation of compounds consisting of Fe 4 N and Fe 2-3 N phases on the surface.…”

Section: Introductionsupporting

confidence: 85%

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Wang

2024

Eng. Res. Express

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Samples of AISI 4140 low alloy steel were nitrided at different conditions by using plasma nitriding. The optical microscopy observation and X-ray diffraction analysis showed that a 3~14 m thick compound layer composed of -Fe2–3N and γ′-Fe4N was formed on the surface after nitriding treatments. The corrosion behavior was evaluated by measuring the anodic polarization curves in a 3.5% NaCl solution along with the observation of corroded surfaces and cross-sectional morphologies using optical and scanning electron microscope. The results indicated that the corrosion resistance of low alloy steel was significantly enhanced through the formation of compound layer. The thickness of compound layer was one important factor in determining its corrosion resistance.

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Section: Introductionsupporting

confidence: 85%

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Wang

2024

Eng. Res. Express

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“…By contrast, an excessive furnace temperature can lead to the phase transition of the sample. When strengthening iron-based materials, the prevalently used temperatures are between 400-600 °C [27][28][29][30]. In this temperature range, as shown in figure 4, the electron density at the sampling point decreased slightly with increasing temperature.…”

Section: Resultsmentioning

confidence: 97%

Simulation of hollow-cathode-nitriding plasma and design of diffusion equipment with DC and RF dual discharge

Zhang¹,

Wang²,

Shao³

et al. 2023

Phys. Scr.

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The formation and diffusion of plasma are complex and critical processes in plasma nitriding. A stable and high-concentration plasma atmosphere can effectively increase the diffusion rate and the thickness of the diffusion layer. In this study, a two-dimensional multi-physics model integrating physical kinetics, energy transfer, mass transfer, and electromagnetic induction was developed. The effect of a hollow-cathode structure on plasma distribution was investigated, and the edge effect observed on nitrided metals was eliminated. The impacts of the essential plasma diffusion parameters were simulated using the developed model. A simple but effective experiment was designed to validate the model. A diffusion furnace with DC and RF dual discharge was designed by adding a high-frequency coil to existing equipment. Subsequently, the effects of the two plasma excitation sources on the overall distribution of plasma were analyzed. Notably, the proposed model is a high-fidelity one based on actual device dimensions; therefore, it can be used to simulate, predict, and control the plasma formation process in the diffusion furnace. In addition, the model can provide reference data and guidance for optimizing the diffusion process and structural design of diffusion furnaces.

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“…In general, a single γ -Fe 4 N phase compound layer of a few microns thick is preferred, because a thick compound layer or a mixed phase compound layer can increase the embrittlement of the surface layer which tends to spall off during service [1][2][3]. There have also been reports that the iron nitride compound layer can improve the corrosion resistance of steels, such that nitrided steels can be used in more harsh environmental conditions [14,21,22]. Indeed, in many engineering applications, such as in marine and off-shore applications, nitrided components are used in corrosive environments under mechanical contact sliding conditions.…”

Section: Introductionmentioning

confidence: 99%

Tribocorrosion Behavior of γ′-Fe4N Nitride Layer Formed on Mild Steel by Plasma Nitriding in Chloride-Containing Solution

Sun

Bailey

2023

Lubricants

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Nitriding has long been used to engineer the surfaces of engineering steels to improve their surface and subsurface properties. The role of the surface compound layer (γ′-Fe4N and/or ε-Fe2-3N) in improving the tribological and corrosion-resistant properties of nitrided steels has been established. However, there have been very few studies on the response of the compound layer to tribocorrosion in corrosive environments. In this work, the tribocorrosion behavior of a 5 μm thick γ′-Fe4N nitride layer produced on mild steel (MS) by plasma nitriding has been studied in a NaCl- containing solution under various electrochemical conditions. The results show that at a cathodic potential of −700 mV (saturated calomel electrode, SCE), where mechanical wear is predominant, the total material removal (TMR) from the γ′-Fe4N layer is 37% smaller than that from the untreated MS, and at open circuit potential, TMR from the layer is 34% smaller than that from the untreated MS, while at an anodic potential of −200 (SCE), the γ′-Fe4N layer can reduce TMR from mild steel by 87%. The beneficial effect of the γ′-Fe4N nitride layer in improving the tribocorrosion behavior of mild steel is derived from its high hardness and good corrosion resistance in the test solution and its ability to resist both mechanical wear and corrosion and to reduce wear–corrosion synergism.

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Effects of plasma nitriding in the corrosion behavior of an AISI 4140 steel using a seawater medium solution

Cited by 10 publications

References 11 publications

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Influence of compound layer on the corrosion resistance of low alloy steel in a 3.5% NaCl solution

Simulation of hollow-cathode-nitriding plasma and design of diffusion equipment with DC and RF dual discharge

Tribocorrosion Behavior of γ′-Fe4N Nitride Layer Formed on Mild Steel by Plasma Nitriding in Chloride-Containing Solution

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