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Alodine and anodizing on aluminum reflectivity data needed

2005

I am looking for reflectivity data for the following metals and metal finishes:

1. Plain Stainless steel (the type used for screws and lock washers)
2. Aluminum treated with Alodine 1201 ⇦ this on eBay or Amazon [affil links]
3. Aluminum treated with black anodizing
4. Aluminum treated with hard anodizing

Any data would be greatly appreciated,

Thank you,

Carol Gordon
- opto-electonics manufacture and design - Barrie, Ontario, Canada

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2005

Dear Carol Gordon

Total reflectivity (%)

Stainless steel: 60
99.99 % Al: 90
Black anodized: 11 (some say 0)

You can expect something similar with hard anodic layers on aluminium alloys with Si and Cu.

I have not the value of Alodine treated aluminium but it must be less that 99.99 % Al but higher than that for black anodized.

Gray value controls reflection, black=no reflection, white=mirror (taken from http://www.fleebagstudios.com/tutorials/textureref.html)

See also: ISO 7669:1986

Hope this is for any use.

Anne Deacon Juhl
- - Trustrup Denmark