めっき技術

Solar heat panels

Ideal solar heat panels excel with increasing absorptance (α) in the solar wavelength region (0.3 - 2.5μm) and decreasing emissivity (ε) in the infrared wavelength region (3.0μm or more). Also, in consideration of thermal stability and thermal conductivity, black chromium plating is superior.
Type of plating Features & characteristic value
Black chromium plating
(1) Sargent bath
- Film composition: CrOx-Cr

- Optimum plating thickness: 180nm

- Primary plating: Nickel plating

- Absorptance of light (α): 0.96
Emissivity of light [ε(t°C): 0.1 at 100°C]

- Thermal stability: 350°C
(2) Trivalent chromium bath - Film composition: Cr-Co

- Optimum plating thickness: 180nm

- Primary plating: Nickel plating

- Absorptance of light (α): 0.96
Emissivity of light [ε(t°C): 0.10 at 100°C]

- Thermal stability: 200°C

(From “Kino Mekki Himaku no Bussei” edited by Denki Mekki Kenkyukai; Nikkan Kogyo Shimbun Ltd.)

採用事例
Solar heat panels
Black-chromium-plated solar collector
(From “Denki Mekki Gaido” edited by Federation
of Electro Plating Industry Association, Japan)

 

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