Nickel-free copper alloy

Details Nickel-free copper alloy Nickel-free copper alloy

1998-10-20

1999-12-07

Ip, Sikyin

Metal treatment

Stock

Copper base

420476, 420477, 420478, C22C 905

Patent

active

059976632

ABSTRACT:
A nickel-free white or yellowish copper alloy having excellent corrosion resistance, with high degree of whiteness or yellowness, which is non-allergenic and therefore is suitable for use, for example, in elements, sliders, stoppers and the like for a slide fastener. The alloy consists of a composition represented by the general formula I: Cu.sub.w Zn.sub.x Mn.sub.y (Al and/or Sn).sub.z wherein w, x, y and z denote weight percentages that are within the ranges of 70.ltoreq.w.ltoreq.85, 5.ltoreq.x.ltoreq.22, 7<y.ltoreq.15, and 0<z.ltoreq.4, or by the general formula II: Cu.sub.w Zn.sub.x Mn.sub.y (Al and/or Sn).sub.z wherein w, x, y and z denote weight percentages that are within the ranges of 70.ltoreq.w.ltoreq.85, 10.ltoreq.x.ltoreq.25, 0<y.ltoreq.7, and 0<z.ltoreq.3, wherein both the above alloys could contain other unavoidable elements. The alloy is in a single .alpha.-phase state at room temperature.

REFERENCES:
patent: 2185809 (1940-01-01), Hackley
patent: 2494736 (1950-01-01), Berwick
patent: 4242133 (1980-12-01), Shapiro et al.

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