Performance of surface chromizing layer on 316L stainless steel for proton exchange membrane fuel cell bipolar plates

Dong, Zhihao; Zhou, Tong; Liu, Jie; Zhang, Xinwen; Shen, Bin; Hu, Wenbin; Liu, Lei

doi:10.1016/j.ijhydene.2019.06.099

Cited by 24 publications

(5 citation statements)

References 45 publications

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“…[6][7][8][9] However, numerous problems remain in the application of bipolar plates produced from stainless steel. 10,11 The metallic ions released from alloys may poison the membrane electrode assembly, resulting in a decline in fuel cell performance. 12 Furthermore, flow field channels increase the process requirement and production time of the bipolar plate, leading to an increase in manufacturing cost.…”

mentioning

confidence: 99%

Enhanced Corrosion Resistance of Additively Manufactured 316L Stainless Steel After Heat Treatment

Zhou

Wang

et al. 2020

J. Electrochem. Soc.

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The microstructures and passivation behavior of selective laser melted 316L stainless steel (SLM SS316L) after various heat treatments (500 °C, 950 °C, and 1100 °C) were investigated. The electrochemical results showed that the SLM SS316L sample that was heat treated at 950 °C exhibited the lowest passive current density. The microstructural characterization analysis indicated that the subgrain structures transformed from dislocation-rich subgrain boundaries into island-like cellular trace structures after heat treatment at 950 °C. This led to improved corrosion resistance due to the elimination of dislocations and the homogenization of the composition. Compositional analyses of the passive film indicated that there was no notable change in the passive film composition after heat treatment at 500 °C and 950 °C. However, heat treatment at 1100 °C promoted the formation of Cr(OH)3 in the passive film, resulting in a reduced corrosion resistance. Based on these results, heat treatment at 950 °C appears to be an adequate post-process for SLM SS316L to optimize the microstructure, while also improving corrosion resistance.

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mentioning

confidence: 99%

Enhanced Corrosion Resistance of Additively Manufactured 316L Stainless Steel After Heat Treatment

Zhou

Wang

et al. 2020

J. Electrochem. Soc.

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“…Kyn. 1, Dong et al 2019, Cho et al 2008. The study is carried out by using the thermodynamic computational software Thermo-Calc and the diffusion-controlled transformation module DICTRA.…”

Section: Methodsmentioning

confidence: 99%

Modeling of Surface Modification of Stainless Steel by Halide Activated Pack Cementation Method

KAHRIMAN

2023

Afyon Kocatepe University Journal of Sciences and Engineering

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In high-temperature applications, ferrous-based materials are important due to their excellent combination of desirable mechanical properties, ease of production, corrosion resistance at room temperature and cost-effectiveness. However, mechanical properties must be optimized against environmental effects. Depending on the industrial applications, various corrosion types may also occur. An approach to preserve the mechanical properties of the structural alloy being protected against corrosion is the application of protective coatings to the surfaces. Diffusion coatings are an effective method to obtain corrosion, oxidation and abrasion resistance against detrimental conditions of high temperature. According to the literature, the halide activated pack cementation method has been widely used for ferrous-based materials for a long time. However, most studies concerned with developing coating applications are based on experimental investigations that include microscopic, chemical, and mechanical analyses. Limited studies have been conducted based on computational alloy approaches. In this study, Cr coating of the AISI 316L steel by halide activated pack cementation method was considered as a diffusional problem and the kinetics of the coating deposition process were examined. The effect of process variables such as temperature, time and the compositions of coating layers formed on the surfaces were investigated thermodynamically with Thermo-Calc software and kinetically with DICTRA module. This approach provides insight into the dependence of solid-state diffusions on the processing parameters, and a better understanding of the phases that form along the coating and substrate material.

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“…However, the corrosion current of the samples is changed from positive to negative with the increase of corrosion time after plasma-nitriding treatment. This indicates that the γ N phase layer of 316 L stainless steel is becoming more and more protective and is beginning to provide cathodic protection [26].…”

Section: Corrosion Behaviormentioning

confidence: 99%

Investigation of evolution of γ _N phase and its effect on conductivity and corrosion resistance of plasma-nitrided 316 L stainless steel bipolar plate for proton exchange membrane fuel cell

Liu,

Li,

et al. 2024

Surf. Topogr.: Metrol. Prop.

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In this work, the evolution of γN phase and its effect on conductivity and corrosion resistance of plasma-nitrided 316L stainless steel bipolar plate was investigated. The variation of γN phase layer and the phase composition in γN phase was analyzed by using SEM with EBSD, XRD and XPS. The results shows that a certain thickness of uniform γN phase layer was formed after plasma-nitriding treatment. As the increase of plasma-nitriding time, the thickness of γN phase layer and the content of nitrogen atoms in γN phase was increased gradually. When the plasma-nitriding time was reached to 24h, the Fe4N compound was found on the sample surface. As the plasma-nitriding time was larger than 10h, a large amount of was formed in γN phase layer owing to serious lattice distortion. After plasma-nitriding treatment, the conductivity and corrosion resistance of the sample was obviously enhanced. With the increasing in the thickness of γN phase layer, the interfacial contact resistance (ICR) of the sample was reduced and the corrosion resistance of the sample was improved. However, the ICR of the sample was significant increased when the Fe4N compound was formed on the sample surface under plasma-nitriding time of 24h condition. When the plasma-nitriding time was larger than 10h, the corrosion resistance of the sample became poor. The formation of crack in γN phase layer and the high surface roughness resulted in the degradation of corrosion resistance of the sample. Under plasma-nitriding time of 5h condition, the comprehensive properties of the sample were the best. The conductivity and corrosion resistance of the sample were enhanced 4 times and 15 times compared with the untreated sample. This work can provide a theoretical reference for the design of 316L stainless steel bipolar plates for proton exchange membrane fuel cells.

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Performance of surface chromizing layer on 316L stainless steel for proton exchange membrane fuel cell bipolar plates

Cited by 24 publications

References 45 publications

Enhanced Corrosion Resistance of Additively Manufactured 316L Stainless Steel After Heat Treatment

Enhanced Corrosion Resistance of Additively Manufactured 316L Stainless Steel After Heat Treatment

Modeling of Surface Modification of Stainless Steel by Halide Activated Pack Cementation Method

Investigation of evolution of γ _N phase and its effect on conductivity and corrosion resistance of plasma-nitrided 316 L stainless steel bipolar plate for proton exchange membrane fuel cell

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Performance of surface chromizing layer on 316L stainless steel for proton exchange membrane fuel cell bipolar plates

Cited by 24 publications

References 45 publications

Enhanced Corrosion Resistance of Additively Manufactured 316L Stainless Steel After Heat Treatment

Enhanced Corrosion Resistance of Additively Manufactured 316L Stainless Steel After Heat Treatment

Modeling of Surface Modification of Stainless Steel by Halide Activated Pack Cementation Method

Investigation of evolution of γ N phase and its effect on conductivity and corrosion resistance of plasma-nitrided 316 L stainless steel bipolar plate for proton exchange membrane fuel cell

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Product

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Investigation of evolution of γ _N phase and its effect on conductivity and corrosion resistance of plasma-nitrided 316 L stainless steel bipolar plate for proton exchange membrane fuel cell