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International Journal of Corrosion
Volume 2011 (2011), Article ID 103785, 7 pages
http://dx.doi.org/10.1155/2011/103785
Research Article

Corrosion Behavior of Passivated 316LSS with Ag Coating as PEMFC Bipolar Plate

1Transportation Equipments and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China
2Department of Marine Engineering, Jiangsu Maritime Institute, Nanjing 211170, China
3Sunrise Power Co. Ltd., Dalian 116085, China

Received 3 April 2011; Accepted 9 August 2011

Academic Editor: F. J. M. Pérez

Copyright © 2011 Naibao Huang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A new chemical passivation technique, which contained 20 g/L hydrogen peroxide, 3.75 g/L sodium silicate, 1.25 g/L sodium carbonate, 3.75 g/L lactic acid and 0.75 g/L 8-hydroxyquinoline, was used to modify 316 stainless steel with Ag coating (Ag-coated 316SS) as PEMFC bipolar plates. The results indicated that the compact passive film had been obtained on the surface of Ag-coated 316SS. The passivation process could not only increase contact angle (from to ) but also decreased pinhole defects of Ag-coated 316SS. Electrochemical test manifested that the passivation process could reduce Ag-coated 316SS's double layer capacitance ( ), and increase its charge transfer resistance. So, it provided significant protection against corrosion for Ag-coated 316SS in PEMFC environment.