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| Electrochemical Characteristic of Stainless Steel Bipolar Plates Deposited with Niobium |
| CAO Caihong , LIANG Chenghao , HUANG Naibao |
| Transportation and Logistics Engineering College , Dalian Maritime University , Dalian 116026, China |
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Abstract Niobium was electrodeposited on 316 stainless steel in water and air-stable choline chloride based ionic liquid (choline chloride: ethylene glycol=1:2（mole ratio)). The electrochemical characteristic of the coated steel was investigated in simulated proton exchange membrane fuel cell (PEMFC) environment. The results indicated that the uniform film was obtained on stainless steel surface. In simulated PEMFC environment, after 316 stainless steel was coated with niobium, its electrochemical characteristics were improved greatly, such as the corrosion potential increased, the passivation current density decreased, the pitting potential moved toward positive, and the reaction resistance increased. The deposited niobium film was mainly composed of Nb, NbO and Nb2O5, among them NbO and Nb2O5 behaved as an anti-corrosion barrier and improved the passavition ability of surface layer. So the electrochemical stability of the stainless steel bipolar plate was increased remarkably.
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