Patent ID: 8833419
Filing Date: 2014-09-16
Classification: B60C,C25D,D07B,Y10T

Abstract:
1. A method of producing a rubber-cord complex obtained by vulcanizing and bonding a rubber to a metal cord comprising at least one drawn plated wire having a brass plated layer, wherein in a wet heat deterioration state after being held in an atmosphere having a temperature of 80° C. and a relative humidity of 95% for 20 days, said rubber-cord complex has the average grain size of crystal grains present in the brass plated layer being not more than 50 nm, and the grain boundary of the crystal grains having a fractal dimension of 1.001 to 1.500, said method comprising: a plating step for forming the brass plated layer containing copper, zinc, and cobalt on the surface of a metal wire; a drawing step for drawing the plated wire provided with the brass plated layer by said plating step so as to obtain said drawn plated wire; a vulcanizing step for vulcanizing and bonding a rubber to the metal cord comprising said drawn plated wire; and said plating step comprising: forming a copper plated layer on the surface of a metal element wire by an electroplating treatment in a copper plating bath wherein a current density of said electroplating treatment for the copper plated layer is 15 to 25 A/dm forming a plated layer of an alloy of zinc and cobalt on said copper plated layer by an electroplating treatment in an alloy bath containing zinc and cobalt wherein a current density of said electroplating treatment for the plated layer of the alloy of zinc and cobalt is 40 to 60 A/dm forming the brass plated layer by thermal diffusion of the copper plated layer and the plated layer of the alloy of zinc and cobalt, wherein the thermal diffusion is conducted by a low temperature diffusion at a temperature of 500 to 550° C.