| 摘要 |
In a reflector containing a surface with high total reflection, which is resistant to mechanical and chemical attack, the body (10) of the reflector has a surface coating system of (a) a pre-treatment layer (11), (b) a functional coating (12) with organo-functional silanes of a metal compound, and (c) a reflective layer (13) containing metal. Layer (a) is applied to the body to increase the adhesion to the over-lying layers, and layer (b) levels and increase the mechanical resistance of layer (c). The reflector is produced by anodising the surface of the substrate, coating with a sol-gel film, hardening the sol-gel film and applying the reflection layer continuously in a strip process. Anodic oxidation is carried out in either (a) a redissolving electrolyte containing sulphuric, oxalic, phosphoric and/or chromic acid or (b) a non-redissolving electrolyte without sealing the oxide film. The sol-gel film is hardened at elevated temperature, such that the temperature measured on the aluminium film under the sol-gel layer is > 110, preferably > 150, especially 150-220 degrees C and is maintained for 10 seconds to 120 minutes. Heating is carried out with infrared radiation, optionally combined with ultraviolet radiation, or with hot gas, preferably hot air. The reflection layer and optionally other layers of the multilayer system are applied by gas or vapour phase deposition. |
