Thin chromium nitride PVD coatings on stainless steel for conductive component as bipolar plates of PEM fuel cells: Ex-situ and in-situ performances evaluation

Olivier Lavigne 1 Catherine Alemany-Dumont 1 Bernard Normand 1 Sandrine Berthon-Fabry 2 Rudolf Metkemeijer 2
1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
2 CEP/Sophia
CEP - Centre Énergétique et Procédés
Abstract : In this paper, two types of chromium PVD coatings (100 nm) have been elaborated on 316L stainless steel (SS) by adjusting the nitrogen flow rate. The first coating is a mixture of Cr 2N and Cr, the second one is a single phase CrN. It is shown that the performances of the material are strongly dependant of the nature of the passive film formed on the chromium nitride layers due to the galvanic coupling between the coating and the substrate. The CrN coated SS shows very good corrosion resistance in simulated PEMFC media. The surface conductivity of the SS is also greatly improved and the CrN coated SS shows an interfacial contact resistance of 10 mΩ cm 2 at 140 N cm -2. Five single cells of stainless steel bipolar plates coated with the CrN film were assembled for performance test. This 5 cell stack does not show any mean voltage degradation over 200 h dynamic cycling. Moreover, the performances of the CrN coated SS bipolar plates are very close to the Au-coated SS bipolar plates.
Keywords : Passive film EIS Bipolar plates Contact resistance Corrosion Ageing
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Article dans une revue
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00699552
Contributeur : Magalie Prudon <>
Soumis le : lundi 21 mai 2012 - 11:04:41
Dernière modification le : lundi 12 novembre 2018 - 11:04:59

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Olivier Lavigne, Catherine Alemany-Dumont, Bernard Normand, Sandrine Berthon-Fabry, Rudolf Metkemeijer. Thin chromium nitride PVD coatings on stainless steel for conductive component as bipolar plates of PEM fuel cells: Ex-situ and in-situ performances evaluation. International Journal of Hydrogen Energy, Elsevier, 2012, 37 (14), pp.10789-10797. ⟨10.1016/j.ijhydene.2012.04.035⟩. ⟨hal-00699552⟩

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