Patent ID: 11905614
Assignee: MITSUBISHI MATERIALS CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 7:
8. A manufacturing method of a terminal material for a connector according to claim 1 comprising:
a plating treatment step performing an Ni plating treatment forming a plating layer made of Ni or Ni alloy on a surface of a base material in which at least a surface is made of Cu or Cu alloy, a Cu plating treatment forming a plating layer made of Cu or Cu alloy, and an Sn plating treatment forming a plating layer made of Sn or Sn alloy in this order; and
a reflowing treatment step performing a reflow treatment after the plating treatment step, wherein
an Ni layer made of Ni or Ni alloy is formed on the base material, a Cu—Sn intermetallic compound layer made of intermetallic compound of Cu and Sn is formed on the Ni layer, and an Sn layer made of Sn or Sn alloy is formed on the Cu—Sn intermetallic compound layer, wherein
the reflowing treatment has a heating step performing a primary heating treatment heating to 240° C. or more at a raising temperature rate of 20° C./second or more and 75° C./second or less and a secondary heating treatment heating after the primary heating treatment at temperature of 240° C. or more and 300° C. or less for time of one second or more and 15 seconds or less;
a primary cooling step cooling after the heating step at a cooling rate of 30° C./second or less; and
a secondary cooling step after the primary cooling at a cooling rate of 100° C./second or more and 300° C./second or less.