Optical And Mechanical Properties Of The Zinc Chromate Absorbing Selective Surfaces

Alia H. Musa; F. Y. M. Al-Shaikley

doi:10.1117/12.949945

6 March 1989 Optical And Mechanical Properties Of The Zinc Chromate Absorbing Selective Surfaces

Alia H. Musa, F. Y. M. Al-Shaikley

Proceedings Volume 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII; (1989) https://doi.org/10.1117/12.949945
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

Selectively absorbing coatings were prepared on zinc electroplated-steel substrates by chromate conversion method after addition of either AgNO₃ or CuSO₄.5H₂0 to the chromate bath supplied by Electrical Industry Company (EIC) in Baghdad, Iraq. The values of the absorptance, ∝, integrated over the solar spectrum and emittance, ε, integrated over the blackbody, radiation at 100°C were calculated from the measured reflectance values for various times an at different concentration of AgN0₃ of conversion. The results indicate that addition 0.2 g/l of either AgNO₃ or CuSO₄.5H₂O to EIC bath resulted in an absorbing selective coatings with ∝ = 0.88 and ε(100°C) = 0.16 for an immersion time of 25 sec (surface 1) and with ∝= 0.85 and 6 (100°C) = 0.10 for an immersion time of 20 sec respectively. Both surfaces shower a little decrease in total absorptance with increasing angle of incidence. The surface analysis (SEM, EDXA) showed cracks of the coatings on surfaces 1 and 2 and the main constituents were zinc and chromium. However, the Zn/Cr ratio was greater for the former. Finally mechanical properties, thermal stability, humidity and outdoor field tests were also carried out for both surfaces.

Citation Download Citation

Alia H. Musa and F. Y. M. Al-Shaikley "Optical And Mechanical Properties Of The Zinc Chromate Absorbing Selective Surfaces", Proc. SPIE 1016, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion VII, (6 March 1989); https://doi.org/10.1117/12.949945

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