Shot material for mechanical plating, and high corrosion resistant coating using same

Abstract

Shot material for mechanical plating is provided, comprising steel core particles clad with an alloy comprising 1 to 5% by weight of aluminum, 3 to 15% by weight of magnesium, preferably 5 to 15% by weight of magnesium, and the balance of zinc and unavoidable impurities. The alloy may contain a total of 1% by weight of impurities. An Fe—Zn alloy layer may be provided between the alloy cladding and the steel core. The shot material may contain 3 to 80% by weight of iron. The preferable average diameter of the shot particles is 100 to 600 μm.

1 . Shot material for mechanical plating, comprising steel core particles clad with an alloy comprising 1 to 5% by weight of aluminum, 3 to 15% by weight of magnesium, and the balance of zinc and unavoidable impurities.  
     
     
         2 . Shot material according to  claim 1 , wherein the magnesium contents in the alloy are 5 to 15% by weight.  
     
     
         3 . The shot material according to  claim 1 , wherein there is an Fe—Zn alloy layer between the alloy cladding and the steel core particles.  
     
     
         4 . The shot material according to  claim 1 , wherein said shot material contains 3 to 80% by weight of iron.  
     
     
         5 . The shot material according to  claim 1 , wherein the shot particles have an average diameter of 100 to 600 μm.  
     
     
         6 . A high corrosion resistant coating having a thickness of 2 to 15 μm formed on a metal material surface by impacting the metal material surface with the shot material according to any of  claim 1 , said high corrosion resistant coating comprising 1 to 5% by weight of aluminum, 3 to 15% by weight of magnesium, up to 20% by weight of iron, and the balance of zinc and unavoidable impurities.  
     
     
         7 . The shot material according to  claim 2 , wherein there is an Fe—Zn alloy layer between the alloy cladding and the steel core particles.  
     
     
         8 . The shot material according to  claim 2 , wherein said shot material contains 3 to 80% by weight of iron.  
     
     
         9 . The shot material according to  claim 2 , wherein the shot particles have an average diameter of 100 to 600 μm.