| Abstract: | On the corrosion-resistance of nickel-tantalum-alloys The corrosion-resistance of different nickel-tantalum-alloys in concentrated phosphoric acid for use as current-collectors in hydrocarbon fuel-cells was measured potentiostatically in the anodic range at temperatures between 100 and 140°C. An alloy with a tantalum contents of 1 wt% showed active dissolution and high corrosion rates at all potentials, an alloy with 10 wt% tantalum showed a passive range at about 0,7 V and alloys with more than 30 wt% tantalum and tantalum itself showed very low corrosion-rates and self-passivation in phosphoric acid. A temptative explanation of the results by considering electronic properties of the alloys was given. |
