Alloys of the type fe3aita(ru) and use thereof as electrode material for the synthesis of sodium chlorate or as corrosion resistant coatings

Abstract

Disclosed is an alloy of the formula: Fe 3−x Al 1+x M y T z Ta t wherein M represents at least one catalytic specie selected from the group consisting of Ru, Ir, Pd, Pt, Rh, Os, Re and Ag; T represents at least one element selected from the group consisting of Mo, Co, Cr, V, Cu, Zn, Nb, W, Zr, Y, Mn, Cd, Si, B, C, O, N, P, F, S, CI, Na and Ti; and Ta represents tantalum. Such an alloy can be used as an electrode material for the synthesis of sodium chlorate. It can also be used as a coating for protection against corrosion.

What is claimed is: 
     
         1 . An alloy of the formula:
   Fe 3−x Al 1+x M y T z Ta t      
       wherein:
 M represents at least one catalytic specie selected from the group consisting of Ru, Ir, Pd, Pt, Rh, Os, Re and Ag; 
 T represents at least one element selected from the group consisting of Mo, Co, Cr, V, Cu, Zn, Nb, W, Zr, Y, Mn, Cd, Si, B, C, O, N, P, F, S, Cl, Na and Ti; 
 x is a number higher than −1 and smaller than or equal to +1 
 y is a number higher than 0 and smaller than or equal to +1 
 z is a number ranging between 0 and +1 
 Ta represents tantalum and t is a number higher than 0 and smaller than or equal to +1. 
 
     
     
         2 . The alloy according to  claim 1 , characterized in that t is a number lower than 0.4. 
     
     
         3 . The alloy according to  claim 2 , characterized in that t is a number lower or equal to 0.2. 
     
     
         4 . The alloy according to any one of  claims 1  to  3 , characterized in that it is a material with a nanocrystalline structure. 
     
     
         5 . The alloy according to any one of  claims 1  to  4 , characterized in that it is a material with a single phase metastable structure. 
     
     
         6 . A method of fabrication of an alloy as claimed in any one of  claims 1  to  5 , in powder form, which consists of milling intensively a mixture of an iron aluminide powder with powders of the M, T and Ta species. 
     
     
         7 . A coating of an alloy as claimed in any one of  claims 1  to  5 , which is prepared by using the powder according to  claim 6  and a thermal spray technique to project the powder on a substrate thus producing a coated electrode or a corrosion resistant coating. 
     
     
         8 . A corrosion resistant coating according to  claim 7 , characterized in that it is made of an alloy according to  claim 1  containing Ti. 
     
     
         9 . Use of an alloy according to any one of  claims 1  to  5 , as an electrode material for the synthesis of sodium chlorate. 
     
     
         10 . Use of an alloy according to any one of  claims 1  to  5 , as a coating for protection against corrosion