How To Repair Anodized Aluminum
Since 1989: Education, Aloha, & the
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"Repairing scratches in black anodized aluminum"
An ongoing discussion from 1998 through 2022 . . .
1998
Q. I piece of work every bit a projection engineer in a R&D lab and we have a project to light amplification by stimulated emission of radiation compose black anodized aluminum. We are looking for a method to clear coat this light amplification by stimulated emission of radiation-etched marking. Clear anodizing the part is out of the question. This particular awarding requires that the coating be applied by spraying or brushing. The blanket needs to be abrasion, corrosion, chemical and UV resistant. Whatever info or leads would be greatly appreciated.
Keith Hoffman
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1998
A. I believe Birchwood Casey has a product called Aluma-black that you can brush on that will form a black, aluminum oxide film.
Hope this is of some assist.
David M. Weaver [dec.] Ed. note: With corking sadness for his family we must propose that David lost his life to a machine accident on Aug. 15, 2003.
- Toccoa, Georgia
Repair of black anodizing afterward machinining scuffs & scratches
2001
Q. I would similar to inquire if there is a method of repair for an anodized part that has been scuffed upwardly and scratched up after machining it. I have a black anodize component that was drilled and tapped and in the deburring procedure information technology became scuffed up and scratched around some of the holes.
Thomas Tracy
- Mt. Sidney, Virginia, USA
^
"Surface Treatment & Finishing of Aluminium and Its Alloys"
Wernick, Pinner & Sheasby
from Abe Books
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2001
A. Practically speaking, there is no repair. Anodize is extremely difficult and to go thru it, you literally beat out it with pressure level from the drill. This causes it to chip abroad from the edge of the hole leaving a cosmetically ugly area.
Impact up anodizing, castor anodizing, will slop chemicals that volition destroy role of the anodizing and be fifty-fifty more ugly.
Precision masking can exist done, just then the chemicals under cut the anodizing or the masking and that is actually ugly. Lastly, you will never lucifer the original black dye. Strip and re-anodize or utilise a black magic marker if it is non a critical area.
James Watts
- Navarre, Florida
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To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-)
Repairing small scratches in black anodized surfaces
2004
Q. My employer makes intensified camera systems in which the housings are predominantly black anodized aluminum. A problem we constantly take is what to do about pocket-sized scratches in the coating which expose the base metal. The trouble is usually but cosmetic. Has anyone found an effective style of coloring these small scratches? We have tried many things like paint or dye practical with fine brushes or pens just nothing really works well.
Nigel Hay
Mechanical Designer - Hastings, Eastward Sussex, U.G.
^
2004
A. A black permanent marker (laundry marker) is rather routinely used to colour racking marks in anodizing shops that are doing non-spec work for strictly corrective reasons. Slightly better might be products like Alumablack (see above). Neither one is anodizing, and neither is a substitute for avoiding the scratches in the first identify through better packaging and handling methods. Either should only exist used with permission of your customer (not easy to get).
It may be possible to spot anodize using a brush anodizing setup, simply not for decorative parts. Practiced luck.
Ted Mooney , P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
^
Darkening an anodized aluminum terminate with steel & plastic parts already attached
December v, 2022
Q. Can y'all darken the color of an anodized aluminum office without stripping the anodizing. The parts have other hardware in both steel and plastic (likely acetal) fastened. Tin can you strip the sealer and dye the anodizing without having to go through the anodization process ?
Ron Rutkowski
- Newtown Foursquare, Pennsylvania USA
^
Aluminum How-To
"Chromating - Anodizing - Hardcoating"
by Robert Probert
(We've sold 750+ copies without a return request)
December 16, 2022
A. Hullo Ron. The "sealer" on anodizing is not a lacquer or organic clear glaze, or anything like that. The sealing process hydrates and swells the anodizing to make full in / shut down the pores. It cannot exist removed short of stripping the anodizing.
The but options you probably have to relieve the assemblies, and they don't sound promising, is to either effort the previously mentioned indelible markers if the area is very small, or to effort applying a tinted (translucent) lacquer. If you can clean the parts thoroughly without damaging them, I remember you tin probably get sufficient, albeit non perfect, adhesion of the lacquer.
Regards,
Ted Mooney , P.Due east.
Striving to live Aloha
finishing.com - Pine Beach, New Bailiwick of jersey
^
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