Aluminum alloy for die casting and method for manufacturing the same

Abstract

An aluminum alloy for die casting. The aluminum alloy for die casting of the present disclosure includes, by wt %, 3≦Si≦10, 3≦Mg≦10, 0.01≦Fe≦1.3, 0.01≦Zn≦2, 0.01≦Cu≦1.5, 0.01≦Mn≦0.5, 0.05≦Ti≦0.15, 0.01≦La≦2, 0.01≦Sr≦2, a balance of Al, and unavoidable impurities.

What is claimed is: 
     
         1 . An aluminum alloy for die casting, comprising, by wt %,
 3≦Si≦10;   3≦Mg≦10;   0.01≦Fe≦1.3;   0.01≦Zn≦2;   0.01≦Cu≦1.5;   0.01≦Mn≦0.5;   0.05≦Ti≦0.15;   0.01≦La≦2;   0.01≦Sr≦2; and   a balance of Al.   
     
     
         2 . The aluminum alloy for die casting as claimed in  claim 1 , wherein 0.1≦Sr≦1.0. 
     
     
         3 . The aluminum alloy for die casting as claimed in  claim 1 , wherein 0.01≦La≦0.5. 
     
     
         4 . The aluminum alloy for die casting as claimed in  claim 1 , wherein the aluminum alloy has a tensile strength of 240 to 270 N/mm 2 , an internal force of 230 to 260 N/mm 2 , and an impact value of 90 to 110 KJ/m 2 . 
     
     
         5 . The aluminum alloy for die casting as claimed in  claim 1 , wherein the aluminum alloy has a corrosion current of 3.5 to 4.5 μA, a potential of −660 to −645 V, and a corrosion resistance of 4.9 to 5.6Ω, as measured by a potentiodynamic acceleration test in an environment comprising 5% sodium chloride. 
     
     
         6 . An aluminum flange shaft for a washing machine, manufactured from the aluminum alloy for die casting as claimed in  claim 1 . 
     
     
         7 . A method of manufacturing an aluminum alloy for die casting, comprising:
 preparing a parent alloy comprising La and Sr;   melting Al, Si, Mg, Fe, Zn, Cu, Mn and Ti in a crucible to comprise, by wt %, 3≦Si≦10, 3≦Mg≦10, 0.01≦Fe≦1.3, 0.01≦Zn≦2, 0.01≦Cu≦1.5, 0.01≦Mn≦0.5 and 0.05≦Ti≦0.15, based on a total weight of the aluminum alloy for die casting; and   adding the prepared parent alloy to the crucible to comprise, by wt %, 0.01≦La≦2 and 0.01≦Sr≦2, based on a total weight of the aluminum alloy for die casting.   
     
     
         8 . The method as claimed in  claim 7 , further comprising:
 after completing the melting, adding flux to the crucible.   
     
     
         9 . The method as claimed in  claim 7 , wherein the parent alloy is an Al—La—Sr ternary parent alloy or an Al—Mg—La—Sr quaternary parent alloy. 
     
     
         10 . The method as claimed in  claim 7 , wherein the melting is carried out at 600 to 700° C.