| 摘要 |
A passthrough method is provided in which the surface of an industrial grade, low-grease precursor made of copper, with a defined surface roughness, is patinated. For this purpose the precursor material, connected as the anode, is passed through an electrolysis bath, containing sodium carbonate and/or sodium hydrogencarbonate as well as sodium sulfite and/or sodium disulfite, with a temperature of 30.degree.C to 90.degree.C and a current density of 1 A/dm2 to 20 A/dm2 as bath parameters, for a residence time of 10 seconds to 12 minutes. The precursor material is rinsed and then moved through a fixing bath at a temperature of 35.degree.C to 95.degree.C for a residence time of 10 seconds to 120 seconds, and lastly, after a further rinsing, is dried. The fixing bath contains at least one of the oxidation agents: hydrogen peroxide (H2O2), potassium chlorate (KCIO3), potassium peroxodisulfate (K2S2O8), potassium permanganate (KMnO4), or copper sulfate (CuSo45H2O).
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