C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/197
C25B 11/04 (2006.01)
Patent
CA 1200529
IMPROVED CATHODE FOR CHLOR-ALKALI CELLS Abstract of the Disclosure An improved cathode with a conductive metal core and a Raney-type catalytic surface predominantly derived from an adherent ternary aluminide intermetallic crystalline precursory outer portion of the metal core is disclosed The precursory outer portion preferably has molybdenum and titanium added to give a precursor alloy having the formula NixMoyTizAl3 where x is within the range of from about 79 to about 94 weight percent, y is within the range of from about 5 to about 20 weight percent and z is within the range of from about 1 to about 5 weight percent of the Ni-Mo-Ti portion of the alloy. Also disclosed is a method of producing a low overvoltage cathode. The method includes the steps of taking a Ni-Mo-Ti core or substrate having about 5-20 weight percentage of Mo and about 1-5 weigh-t percent Ti and coating it with aluminum then heat treating to form a Ni-Mo-Ti-Al ternary alloy with mostly NiAl3 (ordered orthorhombic) crystal structure and then leaching out the Al to produce a ternary NiMoTi alloy Raney surface.
413568
Olin Corporation
Osler Hoskin & Harcourt Llp
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