めっき技術

Copper-based materials

Copper and copper alloys are frequently used for electrical and electronic device parts because they excel in electrical and thermal conductivity, spreadability, drawability, corrosion resistance, spring characteristics, and so on.
Type (JIS) Features Uses
Copper and dilute copper-based alloys (C1000s)
 
(1) Oxygen-free copper (C1020)
Purity 99.96% or more

(2) Tough pitch copper (C1100)
Purity 99.90% or more

(3) Phosphorous deoxidized copper (C1201,C1220,C1221)

(4) Beryllium copper (C1700,C1720)
Be 1.6 – 2.9
- Including little alloy elements
- Electrical conductivity, thermal conductivity, spreadability

- Same as above

- Excellent electrical conductivity

- Excellent spring characteristics (age hardening)
- Electrical parts, electrical machine parts

- Electrical and electronic device parts

- Springs, connectors
Copper-zinc alloys (C2000s)
C2600,C2680,C2720,C2801
Brass Cu: 70 – 60%, Zn 30 - 40
Spreadability, drawability Wiring devices, electrical machine parts, etc.
Copper-zinc-lead alloys (C3000s)
C3560,C3561,C3710, C3713   
Free-cutting brass
Machinability Watches, gears, etc.
Copper-zinc-tin alloys (C4000s)
Naval brass C4621, C4640
Corrosion resistance Tube plates of heat exchangers, etc.
Copper-tin-(lead) alloys (C5000s)
Phosphor bronze
High electrical conductivity, stress relaxation resistance, thermal resistance, bending workability, spring characteristic Switches, connectors, etc., for electronic and electrical measurement hardware, etc.
Copper-nickel alloys (C7000s)
Nickel silver
Spring characteristic Switches, connectors, etc., for electronic and electrical measurement hardware, etc.

(From “Shinsozai eno Mekki Gijutsu no Kaihatsu to Gokin Mekki no Atarashii Yoto Kaihatsu” edited by the Federation of Electro Plating Industry Association, Japan and the Committee for Market Development, Research, and Guidance Program)

採用事例
Copper-based materials
Copper-based materials
(from Japan Copper and Brass Association’s catalog)