Formation of a protective nitride layer by electrochemical nitridation on 316L SS bipolar plates for a proton exchange membrane fuel cell (PEMFC)

Mani, SP and Anandan, C and Rajendran, N (2015) Formation of a protective nitride layer by electrochemical nitridation on 316L SS bipolar plates for a proton exchange membrane fuel cell (PEMFC). RSC Advances, 5 (79). pp. 64466-64470. ISSN 20462069

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Abstract

In the present study, an attempt has been made to increase the corrosion resistance of 316L stainless steel (SS) bipolar plates (Bp) through electrochemical nitridation using a nitrate bearing electrolyte solution of 0.1 M HNO<inf>3</inf> and 0.5 M KNO<inf>3</inf>. The X-ray photoelectron spectroscopy (XPS) studies revealed that the modified SS was covered with ammonium ions and mixed nitrides, namely CrN and Cr<inf>2</inf>N, on the surface. The average contact angle value with water for nitrided SS favored a PEMFC operating environment. The electrochemical corrosion behaviour was studied in a simulated PEMFC environment (0.5 M H<inf>2</inf>SO<inf>4</inf> and 2 ppm of HF) to ensure that the modified SS exhibits enhanced corrosion resistance. Surface resistance values for both untreated and nitrided SS showed low values and increased conductivity after the polarization studies.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User: Mr. BS Shivaram
Date Deposited: 18 May 2018 10:53
Last Modified: 18 May 2018 10:55
URI: http://nal-ir.nal.res.in/id/eprint/12688

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