Journal
APPLIED SURFACE SCIENCE
Volume 388, Issue -, Pages 234-238Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.01.174
Keywords
Nitriding surface treatment; Stainless steel; Corrosion resistance; Bipolar plate; Polymer electrolyte fuel cell
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Funding
- New Energy and Industrial Technology Development Organization (NEDO), Japan
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In order to increase the corrosion resistance of low cost Ni-free SUS445 stainless steel as the bipolar plate of a polymer electrolyte fuel cell, a nitriding surface treatment experiment was carried out in a nitrogen atmosphere under vacuum conditions, while an Ar atmosphere was used for comparison. The electrochemical performance, microstructure, surface chemical composition and morphology of the sample before and after the electrochemical measurements were investigated using linear sweep voltammetry (LSV), X-ray diffraction (XRD), glow discharge optical emission spectroscopy( GDS) and laser scanning microscopy (LSM) measurements. The results confirmed that the nitriding heat treatment not only increased the corrosion resistance, but also improved the surface conductivity of the Ni-free SUS445 stainless steel. In contrast, the corrosion resistance of the SUS445 stainless steel decreased after heat treatment in an Ar atmosphere. These results could be explained by the different surface compositions between these samples. (C) 2016 Elsevier B.V. All rights reserved.
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