Method and apparatus for anticorrosive coating
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.