Electrochemical & Optical Mechanisms of Interference Color Films
干涉色膜的电化学与光学机理
标签：材料科学, 干涉色, 氧化动力学, 薄膜光学, 机理
热着色颜色的本质是 30–80 nm Cu₂O/CuO 复合膜的薄膜干涉：反射光程差 2nd（n≈2.5）决定色相，膜厚每增 10 nm 色相整体红移一档。氧化动力学近似抛物线规律 x²=kt，温度每升高 10 °C 速率常数约增 1.5–2 倍（Arrhenius 关系），这解释了为何 350 °C 保温 10 min 与 320 °C 保温 25 min 可得同一颜色——终点由膜厚而非时间决定。界面扩散控制使膜生长存在"平台期"，生产上利用平台期稳定色相：到色后立即撤热并强冷（压缩空气或金属导热块），抑制膜继续增厚导致色相漂移。
Heat-color hue is thin-film interference in a 30–80 nm Cu₂O/CuO duplex: optical path difference 2nd (n≈2.5) sets the color, shifting one step redder per 10 nm of growth. Oxidation follows a near-parabolic law x²=kt with the rate constant rising 1.5–2× per 10 °C (Arrhenius) — hence 350 °C for 10 min and 320 °C for 25 min can land the same color, since the endpoint is film thickness, not time. Diffusion-controlled interface kinetics create a plateau stage; production exploits it by pulling heat and force-cooling (air blast or metal heat sink) the moment target color is reached, freezing the hue against further drift.