Induction Heating for Local Coloring
感应加热局部热着色
标签：感应加热, 局部着色, 高频, 快速, 热氧化, 边缘
高频感应加热（100–400 kHz，功率 1–5 kW，加热 2–8 s）可对铜器边缘、焊缝区做带状热着色，升温速率比火焰高一个数量级且热影响区仅数毫米，适合成品件返修补色。紫铜工件在空气中 300–500 °C 间移动感应线圈可拉出连续色带。要点：线圈与工件间隙保持 2–3 mm，着色前表面须脱脂至无指纹，否则油渍碳化留永久黑斑。
High-frequency induction (100–400 kHz, 1–5 kW, 2–8 s heating) colors bands along rims and weld zones of copper work, heating an order of magnitude faster than a torch with a heat-affected zone of just a few millimeters — ideal for touching up finished pieces. Sweeping the coil over copper at 300–500 °C in air produces a continuous color band. Keep a 2–3 mm coil gap and degrease thoroughly first, or fingerprints carbonize into permanent black marks. ---