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Black Nickel Coating and Color Anodized Layers for Solar Absorber

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Abstract

Solar selective absorbers are considered as an essential part of a thermal solar collector for which the optical properties are dependent upon their structure and surface morphology. In this paper, optical properties of Ni-pigmented anodized are compared with black electroless nickel coatings. The effect of heat treatment on optical properties of the coatings was also investigated. Anodized films were formed in 6 M phosphoric acid followed by a black coloration process. Scanning electron microscope was used to study the morphology, and X-ray diffraction was employed to identify the phases present. Evaluation of optical properties was carried out by spectral reflectance. Evaluation of the optical characteristics showed that Ni-pigmented anodized and black electroless samples, after heat treatment, had the highest absorption coefficient at about 0.98 as well as the lowest emission coefficient. The ξ factor reached about 6 in heat treated Ni-pigmented anodized layer and offered optimal properties in this research.

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Acknowledgments

The authors would like to express their thanks to Department of Materials Engineering, Isfahan University of Technology for provision of research facilities.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, 8415683111, Isfahan, Iran

    M. Bagheri, F. Ashrafizadeh & M. Hosseini Najafabadi

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  1. M. Bagheri
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  2. F. Ashrafizadeh
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  3. M. Hosseini Najafabadi
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Correspondence to M. Bagheri.

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Bagheri, M., Ashrafizadeh, F. & Najafabadi, M.H. Black Nickel Coating and Color Anodized Layers for Solar Absorber. Trans Indian Inst Met 67, 927–934 (2014). https://doi.org/10.1007/s12666-014-0418-3

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  • DOI: https://doi.org/10.1007/s12666-014-0418-3

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