Inert alloy anode used for aluminum electrolysis and preparation method therefor

Abstract

An inert alloy anode for aluminum electrolysis contains Fe and Cu as primary components and further contains Sn; addition of the metal Sn contributes to formation of an oxide film with strong oxidization resistance and stable structure on the surface of the inert alloy anode and to improvement of the corrosion resistance of the anode; on this basis, the inert alloy anode further contains Ni, Al and Y, addition of the metal Al can prevent the primary metal components from being oxidized, and addition of the metal Y can control alloy to present a desired crystal form in the preparation process to achieve oxidization resistance.

1 . An inert alloy anode for aluminum electrolysis, containing:
 Fe and Cu as primary components;   wherein the inert alloy anode further contains Sn.   
     
     
         2 . The inert alloy anode according to  claim 1 , wherein the mass ratio of Fe to Cu to Sn is (23-40): (36-60): (0.2-5) or (40.01-80): (0.01-35.9): (0.01-0.19). 
     
     
         3 . The inert alloy anode according to  claim 1 , wherein the inert alloy anode further contains Ni. 
     
     
         4 . The inert alloy anode according to  claim 3 , wherein the mass ratio of Fe to Cu to Ni to Sn is (23-40): (36-60): (14-28): (0.2-5) or (40.01-80): (0.01-35.9): (28.1-70): (0.01-0.19). 
     
     
         5 . The inert alloy anode according to  claim 3 , being composed of Fe, Cu, Ni and Sn, wherein the content of Fe is 23-40 wt %, the content of Cu is 36-60 wt %, the content of Ni is 14-28 wt % and the content of Sn is 0.2-5 wt %, or the content of Fe is 40.01-71.88 wt %, the content of Cu is 0.01-31.88 wt %, the content of Ni is 28.1-59.97 wt % and the content of Sn is 0.01-0.19 wt %. 
     
     
         6 . The inert alloy anode according to  claim 3 , further containing Al. 
     
     
         7 . The inert alloy anode according to  claim 6 , being composed of Fe, Cu, Ni, Sn and Al, wherein the content of Fe is 23-40 wt %, the content of Cu is 36-60 wt %, the content of Ni is 14-28 wt %, the content of Al is more than zero and less than or equal to 4 wt % and the content of Sn is 0.2-5 wt %, or the content of Fe is 40.01-71.88 wt %, the content of Cu is 0.01-31.88 wt %, the content of Ni is 28.1-59.97 wt %, the content of Al is more than zero and less than or equal to 4 wt % and the content of Sn is 0.01-0.19 wt %. 
     
     
         8 . The inert alloy anode according to  claim 6 , further containing Y. 
     
     
         9 . The inert alloy anode according to  claim 8 , being composed of Fe, Cu, Ni, Sn, Al and Y, wherein the content of Fe is 23-40 wt %, the content of Cu is 36-60 wt %, the content of Ni is 14-28 wt %, the content of Al is more than zero and less than or equal to 4 wt %, the content of Y is more than zero and less than or equal to 2 wt % and the content of Sn is 0.2-5 wt %, or the content of Fe is 40.01-71.88 wt %, the content of Cu is 0.01-31.88 wt %, the content of Ni is 28.1-59.97 wt %, the content of Al is more than zero and less than or equal to 4 wt %, the content of Y is more than zero and less than or equal to 2 wt % and the content of Sn is 0.01-0.19 wt %. 
     
     
         10 . A preparing method of the inert alloy anode according to  claim 1 , comprising the following steps:
 melting and uniformly mixing the metals Fe, Cu and Sn, and then rapidly casting and cooling the mixture to obtain the inert alloy anode;   or, melting the metals Fe, Cu and Sn at first, then adding and melting the metal Al or Y, and uniformly mixing, or adding and melting the metal Al at first and then adding and melting the metal Y, uniformly mixing, and rapidly casting and cooling the mixture to obtain the inert alloy anode;   or, melting and mixing the metals Fe, Cu, Ni and Sn and then casting the mixture to obtain the inert alloy anode;   or, melting the metals Fe, Cu, Ni and Sn at first, then adding and melting the metal Al or Y, and uniformly mixing, or adding and melting the metal Al at first, then adding and melting the metal Y, uniformly mixing, and casting the mixture to obtain the inert alloy anode.   
     
     
         11 . The inert alloy anode according to  claim 2 , wherein the inert alloy anode further contains Ni. 
     
     
         12 . The inert alloy anode according to  claim 1 , further containing Al. 
     
     
         13 . The inert alloy anode according to  claim 2 , further containing Al. 
     
     
         14 . The inert alloy anode according to  claim 4 , further containing Al. 
     
     
         15 . The inert alloy anode according to  claim 5 , further containing Al. 
     
     
         16 . The inert alloy anode according to  claim 1 , further containing Y. 
     
     
         17 . The inert alloy anode according to  claim 2 , further containing Y. 
     
     
         18 . The inert alloy anode according to  claim 3 , further containing Y. 
     
     
         19 . The inert alloy anode according to  claim 4 , further containing Y. 
     
     
         20 . The inert alloy anode according to  claim 5 , further containing Y.