Thermal nitridation of chromium electroplated AISI316L stainless steel for polymer electrolyte membrane fuel cell bipolar plate

Nam, Dae-Geun; Lee, Hu‐Chul

doi:10.1016/j.jpowsour.2007.04.054

Cited by 81 publications

(36 citation statements)

References 15 publications

(24 reference statements)

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“…Due to strong tensile stresses that develop during electroplating, an electroplated Cr layer can contain many cracks which extend from the nickel substrate to the surface. 29 The electroplated Cr layers then underwent the nitridation process for 10, 30 and 60 min. The cross-section view of the CrN coating layers nitrided for 30 min in Fig.…”

Section: Surface Morphology and Composition Of Crn Layermentioning

confidence: 99%

Corrosion Prevention of Chromium Nitride Coating with an Application to Bipolar Plate Materials

et al. 2014

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The corrosion properties of chromium nitride (CrN) coating on nickel have been evaluated in order to improve the anti-corrosion of metallic bipolar plate materials with applications such as redox flow batteries. The CrN layers are prepared by nitridation of electroplated Cr layers with different thickness. The nitrogen content of CrN coating layers varies from 0.5 to 4.2 wt% depending on nitriding time and coating layer thickness. Electrochemical and chemical corrosion behaviors are investigated by potentiodynamic polarization test in 5% sulfuric acid and by immersion test in 50% sulfuric acid, respectively. Electrochemical analysis of corrosion potential and corrosion current density as well as passivation behavior and chemical corrosion rate prove conclusively that an intact thin CrN layer is more corrosion resistant than thicker layers where cracks are developed. Sheet resistance of CrN coating layers before and after the corrosion test exhibits no significant difference. The improved corrosion resistance and the excellent stability of CrN coating layers suggest an efficient anti-corrosion method for metallic bipolar plate materials.

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Section: Surface Morphology and Composition Of Crn Layermentioning

confidence: 99%

Corrosion Prevention of Chromium Nitride Coating with an Application to Bipolar Plate Materials

et al. 2014

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“…Coating Cr x N film on 316L SS by PBAIP showed high interfacial conductivity and good corrosion resistance in simulated PEMFC environments [126]. The surface of Cr-electroplated 316L SS developed a Cr 2 N layer after thermal nitridation, with much better electrical conductivity than CrN, showed significantly lowered interfacial contact resistance, and demonstrated better corrosion resistance [127]. However, these processes are not economical because either a high temperature was encountered or an expensive coating process was applied.…”

Section: Tinmentioning

confidence: 99%

Reviewing Metallic PEMFC Bipolar Plates

2010

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A bipolar plate is one of the most important components in a polymer exchange membrane fuel cell (PEMFC) stack and has multiple functions. Metallic bipolar plate candidates have advantages over composite rivals in excellent electrical and thermal conductivity, good mechanical strength, high chemical stability, very wide alloy choices, low cost and, most importantly, existing pathways for high‐volume, high‐speed mass production. The challenges with metallic bipolar plates are the higher contact resistance and possible corrosion products, which may contaminate the membrane electrode assembly. This review evaluates the candidate metallic and coating materials for bipolar plates and gives the perspective of the research trends.

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“…The formation of a continuous nitride layer onto the 316L SS by the thermal nitriding of an electrodeposited chromium layer has been reported [13]. Compared to the electrochemical results of the nitrided high chromium alloy or SS [14], the electroplated and nitrided SS showed excellent corrosion resistance, but a higher interfacial contact resistance than other nitrided alloys or SSs.…”

Section: Introductionmentioning

confidence: 95%

Microstructure of chromium nitride layer on stainless steel for polymer electrolyte membrane fuel cell separator

et al. 2009

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The microstructure of the chromium nitride layer formed on 316L Stainless Steel (SS) by electroplating Cr and subsequent thermal nitriding was investigated by electron microscopy. Thermal nitriding was carried out at a nitrogen partial pressure of 100 torr at 1100°C for 2 h. The X-ray Diffraction (XRD) patterns showed that the structure of electroplated chromium was not crystalline and that the nitrided layer was composed of only hexagonal Cr2N phase nitride. The nitride layer showed uniform and columnar-shaped grains of chromium nitride and contained many micro-pores that may have formed due to the volume difference between the amorphous chromium and the crystalline chromium nitride. Chromium oxide was also observed in the nitride layer. It was discovered that the number of micro-pores and oxide particles needs to be decreased in order to improve the interfacial contact resistance.

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Thermal nitridation of chromium electroplated AISI316L stainless steel for polymer electrolyte membrane fuel cell bipolar plate

Cited by 81 publications

References 15 publications

Corrosion Prevention of Chromium Nitride Coating with an Application to Bipolar Plate Materials

Corrosion Prevention of Chromium Nitride Coating with an Application to Bipolar Plate Materials

Reviewing Metallic PEMFC Bipolar Plates

Microstructure of chromium nitride layer on stainless steel for polymer electrolyte membrane fuel cell separator

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