Method of manufacturing fuel system part and fuel system part

Abstract

Disclosed in the present application is a method of manufacturing a fuel delivery pipe. The fuel delivery pipe includes a crude metal made of forged iron, a nickel-phosphorus plating layer formed on an inner surface of the crude metal, and a nonmetal paint film formed on an outer surface of the crude metal. The method includes the steps of: coating the outer surface of the crude metal with paint to form the paint film; machining the crude metal with the paint film formed thereon to form a machined surface inside the crude metal; and electroless plating the machined crude metal in nickel-phosphorus plating solution to form the nickel-phosphorus plating layer on the machined surface.

1 . A method of manufacturing a fuel system part including a crude metal made of forged iron, a nickel-phosphorus plating layer formed on an inner surface of the crude metal, and a nonmetal paint film formed on an outer surface of the crude metal, the method comprising the steps of:
 coating the outer surface of the crude metal with paint to form the paint film;   machining the crude metal with the paint film formed thereon to form a machined surface inside the crude metal; and   electroless plating the machined crude metal in nickel-phosphorus plating solution to form the nickel-phosphorus plating layer on the machined surface.   
     
     
         2 . The method according to  claim 1 ,
 wherein:   the paint is an epoxy resin paint; and   the step of coating the outer surface includes coating the outer surface of the crude metal with the paint by cation electrodeposition coating.   
     
     
         3 . A fuel system part with a fuel path formed therein so as to pass fuel therethrough, the fuel system part comprising:
 a crude metal made of forged iron, the crude metal having a surface of the fuel path and an opposite surface from the fuel path;   a nickel-phosphorus plating layer formed on the surface of the fuel path of the crude metal; and   a nonmetal paint film formed on the opposite surface from the fuel path of the crude metal.   
     
     
         4 . The fuel system part according to  claim 3 , wherein the paint film is a cationically electrodeposited coating directly on an outer surface of the crude metal.