Method of surface treatment of zinc-containing metal substrate, and surface-treated zinc-containing metal substrate

Abstract

A brass-plated steel cord 1 A is immersed in an organic solvent 13 . The steel cord that was immersed in the organic solvent 13 is immersed in an aqueous alkaline solution 22 . Next, the steel cord 1 A that was immersed in the aqueous alkaline solution 22 is immersed in an aqueous silane coupling solution 32 . Finally, the steel cord 1 A that was immersed in the aqueous silane coupling solution 32 is heated. Thus is manufactured a steel cord 1 B equipped with the silane coupling agent, wherein the silane coupling agent is excellently bonded to the surface.

What is claimed is: 
     
         1 . A method of surface-treating a zinc-containing metal substrate, comprising:
 bringing an organic solvent into contact with the surface of a substrate having a zinc-containing metal on a surface layer thereof;   bringing an aqueous alkaline solution into contact with the surface of the substrate that was brought into contact with the organic solvent;   bringing an aqueous silane coupling agent solution into contact with the surface of the substrate that was brought into contact with the aqueous alkaline solution; and   heating the substrate brought into contact with the aqueous silane coupling agent solution.   
     
     
         2 . A method of surface-treating a zinc-containing metal substrate according to  claim 1 , wherein:
 an organic solvent tank filled with the organic solvent is placed inside a water tank filled with water;   said water tank is subjected to ultrasonic vibration; and   said substrate is immersed in the organic solvent vibrated ultrasonically via the water.   
     
     
         3 . A method of surface-treating a zinc-containing metal substrate according to  claim 1 , wherein:
 an aqueous alkaline solution tank filled with the aqueous alkaline solution is subjected to ultrasonic vibration; and   said substrate is immersed in the aqueous alkaline solution vibrated ultrasonically.   
     
     
         4 . A method of surface-treating a zinc-containing metal substrate according to  claim 1 , wherein said aqueous alkaline solution is aqueous sodium hydroxide. 
     
     
         5 . A method of surface-treating a zinc-containing metal substrate according to  claim 1 , wherein said silane coupling agent is an amino-based silane coupling agent. 
     
     
         6 . A method of surface-treating a zinc-containing metal substrate according to  claim 1 , wherein said substrate is a filament having a surface plated with a zinc-containing metal. 
     
     
         7 . A method of surface-treating a zinc-containing metal substrate according to  claim 1 , wherein said substrate is a twisted wire obtained by twisting together multiple filaments each of which has a surface plated with a zinc-containing metal. 
     
     
         8 . A surface-treated zinc-containing metal substrate wherein an amino compound and oil are adhered to the surface of a substrate that has a zinc-containing metal on a surface layer thereof, characterized in that:
 a peak intensity ratio A represented by A=a/b is equal to or greater than 2.6, where a is peak intensity of the amino compound and b is peak intensity of the oil.   
     
     
         9 . A surface-treated zinc-containing metal substrate according to  claim 8 , wherein the surface of said substrate is plated with a zinc-containing metal. 
     
     
         10 . A surface-treated zinc-containing metal substrate according to  claim 8 , wherein said substrate is a twisted wire obtained by twisting together multiple filaments each of which has a surface plated with a zinc-containing metal.