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Degradation of the reflectivity of white anodic-oxide coatings in thermal vacuum treatment

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Abstract

Using the spectroscopic method of diffuse reflection in the region between 0.5 and 6 eV, we investigate the degradation of reflectivity in thermal vacuum treatment of white anodic-oxide coatings on an Al alloy (Al–AOC) that are used as thermoregulating coatings of space vehicles. It is established that at T≥350 K absorption bands at 4.05 and ∼4.7 eV resembling those induced by UV irradiation in vacuum appear in the diffuse reflection spectra of Al–AOC. The kinetics of the increase of absorption in heating Al–AOC with a constant rate correlates with the rate of gas liberation from specimens. We assume that a thermally activated reaction with the formation of color centers identical to those produced by the photoeffect occur in Al–AOC in vacuum at T≥350 K. This process is accompanied by desorption of molecular products.

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References

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Authors and Affiliations

  1. Scientific-Research Institute of Physics of the St. Petersburg State University, 1, Uliyanovskaya St., Petrodvorets, 198904, St. Petersburg, Russia

    V. N. Kuznetsov & A. A. Lisachenko

  2. Central Specialized Design Office, Samara, Russia

    I. V. Ivanova & V. A. Konnov

Authors
  1. V. N. Kuznetsov
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  2. A. A. Lisachenko
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  3. I. V. Ivanova
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  4. V. A. Konnov
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Additional information

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 5, pp. 664–667, September–October, 1997.

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Kuznetsov, V.N., Lisachenko, A.A., Ivanova, I.V. et al. Degradation of the reflectivity of white anodic-oxide coatings in thermal vacuum treatment. J Appl Spectrosc 64, 678–682 (1997). https://doi.org/10.1007/BF02675333

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  • DOI: https://doi.org/10.1007/BF02675333

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