Abstract
Langmuir isotherm adsorption theory is involved in the conventional model to predict the corrosion resistance of Nb and Nb alloys. It is illustrated that the anti-corrosion properties of Nb are dependent on the crystal plane, pH values and solution temperature. Nb(110) plane with the lowest Esurf/ρ and the highest Eesc present the slower dissolution of Nb atoms, and then exhibits the best anti-corrosion performance. Alloying with Cr, Cu, Mo, Ti and Ta destroys the stability of Nb(110) plane and thus degrades the corrosion resistance performances. Moreover, the anti-corrosion performance is improved with increasing pH values because of the decreasing coverage of H+ ions. The escape rate of Nb atoms will be accelerated at the elevating temperature, and thus the anti-corrosion performance be degraded. Therefore, an appropriate design of coating texture and solution environment could improve the anti-corrosion performances of bipolar plates.
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