Copper alloy for a silver coloured product having an antimicrobial surface

摘要

Copper material having a high resistance to discoloration of its silver color, under the influence of contact with the skin and/or moisture, for the preparation of a silver-colored product with an antimicrobial surface, preferably with an antimicrobial contact surface, which is not adapted to be worn on the human body, comprises a alloy containing >= 60 wt.% of copper (Cu), 10-27.5 wt.% of zinc (Zn), 1-20 wt.% of manganese (Mn), where the ratio of Zn to Mn is 1:1-8:1, and the other components of the alloy in wt.% depending on the content of nickel (Ni). Copper material having a high resistance to discoloration of its silver color, under the influence of contact with the skin and/or moisture, for the preparation of a silver-colored product with an antimicrobial surface, preferably with an antimicrobial contact surface, which is not adapted to be worn on the human body, comprises a alloy containing >= 60 wt.% of copper (Cu), 10-27.5 wt.% of zinc (Zn), 1-20 wt.% of manganese (Mn), where the ratio of Zn to Mn is 1:1-8:1, and the other components of the alloy in wt.% depending on the content of nickel (Ni) contains one of the following groups (a)-(d) and a corresponding residue from incidental impurities, where: the group (a) comprises 0.1 to less than 0.5 wt.% of Ni, 16-25 wt.% of zinc (Zn), greater than 11 to 20 wt.% of manganese (Mn), greater than 1 to 3.5 wt.% of aluminum (Al) and = 0.04 wt.% of tin (Sn); the group (b) comprises 0.5-6 wt.% of Ni, 16-25 wt.% of Zn, 11-20 wt.% of Mn and greater than 1 to 3.5 wt.% of Al; the group (c) comprises greater than 6 to 10 wt.% of Ni, 10-15 wt.% of Zn, 5-10 wt.% of Mn and = 2 wt.% of Al; and the group (d) comprises greater than 10 to 25 wt.% of Ni, 10-27.5 wt.% of Zn, 2-5 wt.% of Mn and = 1.5 wt.% of Al.