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Abstract

The performance of porous nickel has been studied under the conditions of operation in advanced alkaline electrolysers. Its performance has been compared with wrought nickel and woven nickel gauze in a number of studies using development and laboratory electrolysers. The mode of deterioration and ultimate failure of porous nickel when used as electrodes and diaphragms has been evaluated and it has been shown that: 1. The corrosion rate of porous nickel is very similar to that of wrought nickel, and that the fine porosity does not act as a crevice to enhance corrosion. 2. As a cathode, the use of all types of porous nickel presents no problems provided the cathodic potential is maintained. 3. As an anode, the oxidation rate is strongly dependent on temperature. The 0.25 mm thick porous nickel examined has not been found satisfactory at 200 degrees C and 160 degrees C although thicker wrought material work perfectly well, the high surface area and fine porous structure weakens mechanical properties too much. At 95 degrees C the porous materials work perfectly satisfactorily. So the upper temperature limit of applicability of this product working as an anode at 1A/cm**2 is somewhere in the range 95 to 160 degrees C and this needs to be further defined, in long term tests. 4. Porous nickel as a diaphragm, must be maintained over a narrow cathodic potential range which avoids hydrogen evolution on the diaphragm surface. The limiting temperature for operation without polarization will be similar to that for the material when used as an anode of nickel.

Additional information

Authors: GILES R D INCO ALLOY PRODUCTS LTD., TECHNOLOGY CENTRE, BIRMINGHAM (UK), INCO ALLOY PRODUCTS LTD., TECHNOLOGY CENTRE, BIRMINGHAM (UK)
Bibliographic Reference: EUR 9904 EN (1985) MF, 143 P., BFR 300, BLOW-UP COPY BFR 715, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124001700 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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