Method and apparatus for anticorrosive coating

Abstract

A method of applying an anticorrosive coating to a metal workpiece includes coating the workpiece with anticorrosive metal by electrical arc spraying, and then coating the anticorrosive metal with a polymeric protective coating. The method also includes quenching the twice-coated workpiece.

1 . A method of providing an anticorrosive coating on a metal workpiece, said method comprising adhering to said workpiece a metallic coating of anticorrosive metal, principally composed of zinc, by spraying particles of said anticorrosive metal onto a metal surface of said workpiece, and thereafter coating said anticorrosive metal with a protective coating.  
     
     
         2 . The method of  claim 1  wherein said metallic coating has a thickness within a range of about 1.5 mils to about 2.0 mils.  
     
     
         3 . The method of  claim 1  wherein said metallic coating is composed of zinc within a range of about 85% to about 100% by weight, with a balance principally of aluminum.  
     
     
         4 . The method of  claim 1  wherein said metallic coating comprises about 98% zinc and about 2% aluminum by weight.  
     
     
         5 . The method of  claim 1  wherein said protective coating is principally epoxy.  
     
     
         6 . The method of  claim 1  wherein said metal workpiece is steel rebar.  
     
     
         7 . The method of  claim 1  wherein said spraying is accomplished by electric arc spraying.  
     
     
         8 . An anticorrosive metal workpiece having an anticorrosive metallic coating principally composed of sprayed zinc particles adhered to a metal surface of said workpiece, said metallic coating being covered by a protective coating.  
     
     
         9 . The workpiece of  claim 8  wherein said metallic coating has a thickness within a range of about 1.5 mils to about 2.0 mils.  
     
     
         10 . The workpiece of  claim 8  wherein said metallic coating is within a range of about 85% to about 100% zinc by weight, with a balance principally of aluminum.  
     
     
         11 . The workpiece of  claim 8  wherein said metallic coating comprises about 98% zinc and about 2% aluminum by weight.  
     
     
         12 . The workpiece of  claim 8  wherein said protective coating is principally epoxy.  
     
     
         13 . The workpiece of  claim 8  wherein said workpiece is steel rebar.