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Chemical oxidation and spectral selectivity of austenitic stainless steel AISI 321 (for use in solar-energy applications)

Author

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  • Sharma, V.C.
  • Sharma, A.
  • Ilenikhena, P.

Abstract

Polished samples of austenitic stainless steel AISI 321 were chemically oxidized in 0.1–0.6 M aqueous solutions of chromic and sulphuric acids at 90 °C for an oxidation time of 25 min, as well as for oxidation times ranging from 10 to 32 min in 0.6 M solution. Chemical oxidation of the stainless steel produced interference films ranging in colour from light-blue to deep-blue, purple-red and peacock-green. Measurements of solar absorptance (αs) and total hemispherical thermal emittance (ϵh) showed that all the oxidized surfaces were spectrally selective. The most favourable spectrally selective surface was deep-blue in colour and it had values of αs = 0.85 ± 0.01 and ϵh = 0.18 ± 0.01. This surface was prepared after an oxidation time of 12 min at a concentration of 0.6 M of chromic and sulphuric acids. For the unoxidized polished stainless steel, the αs and ϵh were 0.38 ± 0.01 and 0.15 ± 0.01 respectively. No significant changes in the optical properties of the films were observed after 6 months exposure to highly humid tropical weather conditions.

Suggested Citation

  • Sharma, V.C. & Sharma, A. & Ilenikhena, P., 1988. "Chemical oxidation and spectral selectivity of austenitic stainless steel AISI 321 (for use in solar-energy applications)," Energy, Elsevier, vol. 13(10), pages 749-754.
    • Handle: RePEc:eee:energy:v:13:y:1988:i:10:p:749-754
    DOI: 10.1016/0360-5442(88)90057-6
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