Finishing aluminum for special optical properties
I have a spacecraft application, and need a process (anodize or some other) which will provide Absorptance, Alpha < .65 and a ratio of Absorptance to Emittance (Alpha/Epsilon)< .8
I am trying to avoid paints, and am hoping to find an anodize or plating process. I have heard that Sulfuric Acid anodize may work but I don't have data.
If you have any info or suggestions please let me know.
A website with solar absorptance "a" and normal emittance "e" values for various coatings from NASA-GSFC can be found at:
Based on this data, clear anodize will meet your needs.
a = 0.27-0.35
e = 0.76-0.84
Luke Engineering & Mfg. Co. Inc.
Ed. note: that site no longer exists, so we have struck thru the URL
Apply for a free subscription to NASA Tech Briefs . . .
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There's an article in the Nov. '96 NASA Tech Briefs (vol. 20 No.11) page 69, that may be of interest to you.Derek Vanek
We have worked with Rocket Research on Thermal Emittance values in anodizing for space station freedom & McDonnell Douglas, Please contact us.
Max T. Faeth|
- Los Angeles, California, USA
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