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Anonymous 03/21/14(Fri)10:44 UTC+1 No.639168 Report

How to remove this rust from an aluminum bike without damaging the frame?

I bought it used a few days ago, it's in good shape but the the bolts were rusty and the rust propagated to the bolt holes

So how can I remove the rust without damaging the frame?
>>
Anonymous 03/21/14(Fri)10:47 UTC+1 No.639171 Report

>>639168
>rust
>alumininininium
>>
Anonymous 03/21/14(Fri)10:47 UTC+1 No.639172 Report

>>639168
scrape it out with something or file most of it off then use wire wool and wd40, just stuff it in and spin it around
>>
Anonymous 03/21/14(Fri)12:33 UTC+1 No.639191 Report

>>639168
If it really an aluminum frame then the rust is just residual from the rusty screw. The aluminum isn't actually rusty. Just wipe it out with a small brush and some WD40 if it bothers you that bad. Personaly I'd just coat the hole with grease and pop a new screw in there to spread it over the threads and call it good.
>>
Anonymous 03/23/14(Sun)21:05 UTC+1 No.640327 Report

Naval jelly couldn't hurt.
>>
Anonymous 03/23/14(Sun)21:15 UTC+1 No.640337 Report

>>639191
Oh yeah, and use stainless or at least galvanized bolts next time. Dissimilar metals in direct contact are corrosion hotspots.
>>
Anonymous 03/24/14(Mon)03:13 UTC+1 No.640618 Report

toothbrush and WD40.
>>
Chainring 03/24/14(Mon)05:20 UTC+1 No.640683 Report

i dont know if its been mentioned yet but aluminum doesnt rust. what is rusting is another metal. use CLR (if its real bad) or WD40 if its just mild.
>>
Anonymous 03/24/14(Mon)14:43 UTC+1 No.640888 Report

I would not useCLR! I looked up the ingredients in the Material Safety Data Sheet:http://www.jelmar.com/MSDS.htm

CLR is acid, and it'sfine on porcelain like toilets, but as you might expect, the MSDS says it's incompatible with metals except for stainless steel and chrome.
>>
Anonymous 03/24/14(Mon)17:40 UTC+1 No.640924 Report

>>640888
its steel that is rusting, not aluminum.
>>
Anonymous 03/24/14(Mon)18:06 UTC+1 No.640933 Report

The frame is aluminum but the screw holes are made of metal, thats why it is rusting
>>
Anonymous 03/24/14(Mon)18:17 UTC+1 No.640936 Report

Op here, I got rid of the rust:

>rolled sandpaper into a small tube and spin it inside the hole
>used metal wool to remove the remaining weaker rust
>wd-40 for cleaning
>>
Anonymous 03/24/14(Mon)18:29 UTC+1 No.640943 Report

>>640936
Since I'm on 4chan, I'm just gonna assume that's a man.
>>
Anonymous 03/24/14(Mon)18:32 UTC+1 No.640944 Report

>>640943
Good call.
>>
Anonymous 03/24/14(Mon)21:08 UTC+1 No.640993 Report

>>640943
you didn't assume, you learned

nobody would assume that's a man
>>
Anonymous 03/24/14(Mon)22:55 UTC+1 No.641022 Report

>>639171
>implying aluminium doesn't rust

>>639191
>implying corrosive passivation doesn't happen

>>640683
>saying aluminium doesn't rust

>>640933
>implying aluminium isn't a metal

Aluminium corrodes to form a layer of aluminium(iii) oxide extremely quickly in air. This is called passivation, and prevents further corrosion.

In this case it's either just the bolts that were rusty, and there's shit on the frame, or the threaded inserts attached to the frame are made of something else than aluminum. I'd probably go for the second one.

>639172
>640618
>640683
>640936

Don't use fucking WD40, it's a water displacement compound. Go ask for some actual fucking rust dissolver at the HW store. WD40 isn't fucking miracle cream. And for fuck's sake, don't rub steel wool in a screw hole that is potentially aluminium.

Then, when you're done cleaning the shit out with a proper rust remover, and you've wiped it out with a cloth or some paper: Go get yourself some bolts that aren't going to rust.
>>
Anonymous 03/24/14(Mon)23:44 UTC+1 No.641041 Report

>>641022
>>implying aluminium doesn't rust
>Aluminium corrodes
>>
Anonymous 03/25/14(Tue)00:31 UTC+1 No.641070 Report

>>641041
Rust and corrosion are the same thing. Rust can be used to refer iron rust specifically, but can also be used otherwise. You gonna try telling me only gelatin gelates next?
>>
Anonymous 03/25/14(Tue)00:35 UTC+1 No.641074 Report

>>641070
>Rust can be used to refer iron rust specifically, but can also be used otherwise.

You telling me Silicium, Hydrogen and apples also rust, because they're subject to oxidation?
>>
Awesome Funposter 03/25/14(Tue)06:23 UTC+1 No.641254 Report

>>641070
>rust
>noun
>a reddish- or yellowish-brown flaky coating of iron oxide that is formed on iron or steel by oxidation, esp. in the presence of moisture.

Rust is specific to a certain kind of oxidation on ferritic metals. Fun fact: the etymological root for rust is red.
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