| 摘要 |
An eight-karat gold alloy with discoloration resistance and multiple colors according to the present invention comprises the gold alloys of a gold series color, a white series color and a pink color series. The gold alloy of the gold series color is composed of, in wt%: Au: 33-34; Ag: 10-20; Cu: 30-50; Zn: 5-15; Pd: 0.5-3.0; Ir: 0.01-0.2; Rh: 0.01-0.1; Ru: 0.01-0.1; Ge or Nd: 0.01-0.50; and other inevitable impurities. The gold alloy of the white series color is composed of, in wt%: Au: 33-34; Ag: 20-40; Cu: 5-10; Zn: 20-30; Pd: 1.0-30; Ir: 0.01-0.2; Rh: 0.01-0.1; Ru: 0.01-0.1; Ge or Nd: 0.01-0.50; and other inevitable impurities. The gold alloy of the pink series color is composed of, in wt%: Au 33-34; Ag: 10-20; Cu: 40-60; Zn: 1-5; Pd: 0.5-3.0; Ir: 0.01-0.2; Rh: 0.01-0.1; Ru: 0.01-0.1; Ge or Nd: 0.01-0.50; and other inevitable impurities. The gold alloy with multiple colors is manufactured by using a vacuum high frequency melting furnace, a vacuum state and an argon gas, which control the melting atmosphere, for actively inhibiting oxidization of a volatile base metal such as Zn. The ingot of the gold alloy is manufactured as a product in the form of thin sheets or granules by being cold-rolled after being heat-treated at high temperatures and annealed. |
