Zn-Ti液态金属浴热镀锌钢板颜色的相消光干涉设计
Designing the color of hot-dip galvanized steel sheet through destructive light interference using a Zn-Ti liquid metallic bath
摘要：
热浸镀锌钢板的颜色以可再现的方式使用液体Zn-Ti金属浴、空气气氛和控制浴温度作为唯一的实验参数来调节。只有在空气中冷却并浸入含钛锌液中的样品才有着色现象。对于浸入含0.15wt% Ti的Zn浴中的样品，在低于792 K（519 ℃）浴温度下颜色保持金属色（灰色）;在814 K下为黄色，在847 K下为紫色，在873 K下为蓝色。随着镀液温度的升高，附着的Zn-Ti层的厚度从52 μ m逐渐减小到32 μ m，而外部TiO 2层的厚度从24 nm逐渐增加到69 nm。由于锌浴的小Al污染，在外部TiO 2层和内部宏观Zn层之间发现薄的（约2nm）富氧化铝层。结果表明，纳米TiO 2薄膜的颜色变化主要是由于薄膜表面形成了一层薄的TiO 2层，薄膜的颜色随TiO 2层厚度的变化而变化，这主要是由于可见光对纳米TiO 2层的相消干涉所致。建立了一个复杂的模型来解释使用已知的化学热力学，粘附，热流，化学反应动力学，扩散和光学的关系的结果。
英文摘要：
The color of hot-dip galvanized steel sheet was adjusted in a reproducible way using a liquid Zn-Ti metallic bath, air atmosphere, and controlling the bath temperature as the only experimental parameter. Coloring was found only for sample s cooled in air and dipped into Ti-containing liquid Zn. For samples dipped into a 0.15 wt pct Ti-containing Zn bath, the color remained metallic (gray) below a 792 K (519 C) bath temperature; it was yellow at 814 K, violet at 847 K, and blue at 873 K. With the increasing bath temperature, the thickness of the adhered Zn-Ti layer gradually decreased from 52 to 32 micrometers, while the thickness of the outer TiO2 layer gradually increased from 24 to 69 nm. Due to small Al contamination of the Zn bath, a thin (around 2 nm) alumina-rich layer is found between the outer TiO2 layer and the inner macroscopic Zn layer. It is proven that the color change was governed by the formation of thin outer TiO2 layer; different colors appear depending on the thickness of this layer, mostly due to the destructive interference of visible light on this transparent nano-layer. A complex model was built to explain the results using known relationships of chemical thermodynamics, adhesion, heat flow, kinetics of chemical reactions, diffusion, and optics.
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