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Sealing anodized or cc layer ?
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Source：Internet Author：Unknow Pubdate：2010-07-11
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bikeit (Aerospace)
11 Jun 10 8:23
Hi Guys,
first: Nice to be here, this is my first thread !
I'm currently working on a project for ESA and am diving through the requirements for surface finishing of aluminium.
In the requ. there is a passage saying "...anodized layers and CC layers shall be sealed ... when used as the final surface finish of a part."
Maybe one of you can help me with this:
- Why sealing an anodized or chemical conversion layer ? Aren't they supposed to reduce the affect of corrosion on the surface and can be considered being sort of "inert"? (BTW: no corrosive media in space ...)
-If it's really necessary to seal them ... what could be the desired process ?
Thanks a lot in advance,
Bikeit
mcgyvr (Mechanical)
11 Jun 10 8:35
http://en.wikipedia.org/wiki/Anodizing#Sealing 字串7
swall (Materials)
11 Jun 10 9:26
Unsealed anodic coatings on aluminum are porous, so for corrosion resistance, they need to be sealed. The sealing process closes up the pores in the columnar aluminum oxide structure. Sealing reduces the film hardness, so for wear resistance the coating is left unsealed. Never heard of sealing for chemical conversion processes. Even if your application is in space, the sealing might be beneficial to protect the parts from corrosion during storage and transit.
bikeit (Aerospace)
14 Jun 10 2:27
Thanks for your informations. Actually i overread this part (sealing) of information in the german wikipedia-article, since the german keyword for this process is more like "compacting" or "densify" the anodized surface.
...learned something important.
Again: thanks a lot for your support! 字串6
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