Polishing clear anodizing?
Is it possible to lightly polish clear anodizing without going through it? Would it even be noticeable?
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If you mean to clean it of something like dried oil or tar, then yes, if you're careful
If you mean to make it shinier, then absolutely not. |
Originally Posted by FBinNY
(Post 22718628)
If you mean to clean it of something like dried oil or tar, then yes, if you're careful
If you mean to make it shinier, then absolutely not. |
Originally Posted by smd4
(Post 22718623)
Is it possible to lightly polish clear anodizing without going through it? Would it even be noticeable?
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Instead of polishing the anodized I'll use car wheel cleaner, spray on and rinse off, and a very light brush to remove the muck that water alone did not.
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https://cimg3.ibsrv.net/gimg/bikefor...4fee78b89.jpeg
I use Mother's Mag and Aluminum polish on a large number of items might work for your application |
Thanks everyone. I don’t want to remove the anodizing. I don’t think I’ll be able to get the shine I’m looking for unless I remove it.
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Originally Posted by smd4
(Post 22720274)
Thanks everyone. I don’t want to remove the anodizing. I don’t think I’ll be able to get the shine I’m looking for unless I remove it.
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Originally Posted by masi61
(Post 22720309)
which specific part are you considering removing the anodizing from?
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Originally Posted by smd4
(Post 22720367)
I don’t want to remove any anodizing. I was wondering if it might be possible to get a higher shine on some of my standard DA 7700 parts to more closely match the 25th Anniversary parts I have (brakes and RD). There’s nothing wrong with the standard finish; it’s pretty well polished as is, so it’s not worth the risk for a modicum of improvement.
if the defect does indeed go all the way through though, I have noticed that Shimano clear silver anodized parts can get some strange white tendrils of corrosion that seem to travel under the clear anodizing. When that happens your serviceable vintage 7700 part is more user grade and not show quality anymore. Yes, this is kind of a shame. To perfect these parts to the 25th anniversary level of polish, the cranks would be the easiest to strip the anodizing and put a mirror polish on. The brake arms, the aero brake levers, the shifter paddles & pivoting parts of the front and rear derailleurs would be much more difficult to polish back to perfection due to all the rivets, bushings, locking pins, etc… that make the contours of the part much more convoluted. Any amount of road rash can make ugly that formerly lovely part. I think there is a component restoration service in Australia that will do mirror polishing on 7700 bits but it is expensive and I believe the results could be variable, not to mention that mirror polished raw aluminum needs to be freshened up with metal polish whenever it is ridden in the rain for example. If you enjoy polishing parts and have the time for it then it is possible to keep your vintage parts looking jewel-like. What would be really cool is if said restoration company could make a titanium bolt kit and also a kit with stainless hardware for the pivots & slip pins and such that substitutes circlips at the pivots and would permit a full teardown & rebuild by the average weekend mechanic. |
FWIW- Anodized parts vary greatly in luster, from a satin finish to a fairly high shine.
The degree of shininess depends on the metal BEFORE anodizing and the degree of etching when anodized. Getting a shiny end result calls for polishing the part, then using minimal etch when processed. |
Originally Posted by FBinNY
(Post 22720412)
The degree of shininess depends on the metal BEFORE anodizing and the degree of etching when anodized.
Getting a shiny end result calls for polishing the part, then using minimal etch when processed. |
The 7402 crank set in my stash has an issue with finish. The solution appears to be simple to strip the ano and polish.
https://live.staticflickr.com/65535/...3a8e6c4e_b.jpgP1030625 on Flickr |
Anodizing 101.
What is Anodizing?Anodizing is an electrochemical conversion process in existence since the 1930s. Several metals are capable of being anodized including aluminum, magnesium, titanium, and tantalum. Anodized aluminum is used in many applications due to its low cost, aesthetic qualities, and ideal mechanical properties.Unlike most protective coatings, anodizing permanently changes the outer structure of the metal. When aluminum is exposed to air it naturally develops a thin aluminum oxide film that seals the aluminum from further oxidation. The anodizing process makes the oxidized surface much thicker, up to several thousandths of an inch thick. The hardness of the anodized aluminum oxide coating rivals that of a diamond, enhancing the abrasion resistance of the aluminum. The added depth of the oxide layer improves the corrosion resistance of the aluminum, while making cleaning the surface easier. The porous nature of particular types of anodizing makes it possible to dye the aluminum a variety of colors, making it more attractive. Anodizing typically ranges up to 5 mils thickness.The three most common variations of aluminum anodizing include chromic anodizing (type I), sulfuric anodizing (type II) and hard anodizing (type III).
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