|
|
Post by ron on Oct 24, 2006 19:34:27 GMT
Hi All
I've acquired a pile of BA bolts and studs which have a bit of surface rust on them, they have been lightly oiled previously to stop the rust getting worse, any suggestions how to bring them back to shiny? ie how to remove oily rust.
Ron
|
|
|
|
Post by greasemonkey on Oct 24, 2006 20:55:16 GMT
HI Ron
What about a scotch brite pad? You can get them on an arbour for use in an electric drill now or else a wire brush.
Andy
|
|
|
|
Post by baggo on Oct 24, 2006 22:44:59 GMT
Hi Ron,
I think you are going to be limited to physical methods to remove the rust if you want the bolts etc to remain bright. I would think that any chemical method will leave the rusty bits of the steel stained black or similar, although you could probably polish it off afterwards. As Andy suggests, perhaps a small wire brush, maybe a brass one, would do the job, especially if the threads are rusty. You would probably be better to degrease and dry them to remove the oil first. If the bits are small it could be a long fiddly job.
Another idea might be to degrease and dry them, put them in a tin or jar with some sand and give them a good shake! Don't know how long that would take though, maybe days! ;D
John
|
|
|
|
Post by ilvaporista on Oct 25, 2006 7:41:02 GMT
How about tumbling them in sand? I have not tried it on rusty steel but it might work and save you the work of scrubbing small BA screws.
I rigged up a simple tubler using a tin with a plastic lid (farley's follow on powdered milk) driven by one of the kids old battery powered cars, with rubber tyres, upside down and a roller from an ex toilet roll holder. The motor was conneted to a controller from the model railway. Run at a low speed and with a light load inside it worked to clean up small brass parts after silver soldering.
No prizes for beauty and the motor gave up after hard use. I am sure something more robust could be made at low cost.
|
|
|
|
Post by greasemonkey on Oct 25, 2006 8:49:59 GMT
Hi All
I d forgotten about tumblers. Have a look on ebay at stones they used to get used a a lot for polishing them.
Andy
|
|
|
|
Post by ron on Oct 25, 2006 9:53:07 GMT
The tumbler idea sounds good, I've still got some glass beads and silicon carbide from when I had a blast cabinet, I'll see if I can rig something up, there's quite a pile of screws, it would be a shame to just bin them.
Ron
|
|
|
|
Post by ron on Oct 25, 2006 19:45:10 GMT
Adrian
You're idea with the tumbler worked well, I degreased them with cellulose thinners and used a 3" dia plastic tub quarter filled with aluminium oxide powder and a pile of screws, gripped it in the lathe chuck at a low speed for a couple of hours and they came out a nice matt steel finish.
It would probably be quicker with fresh abrasive, mine's been well used.
Ron
|
|
|
|
Post by Tel on Oct 25, 2006 20:39:06 GMT
Derust with dilute phosphoric acid, then wash in hot water dry 'em, stick 'em in a tin with some light oil & give 'em a shake.
|
|
|
|
Post by Shawki Shlemon on Oct 26, 2006 7:59:05 GMT
Hi
Soak them in kill rust or equivalent then dry them and paint them the required colour when used . To get them shiny one by one is a very hard and long process .
|
|
|
|
Post by ron on Oct 26, 2006 9:27:02 GMT
Tel
Any experience I've had with Phosphoric acid based rust removal fluids leaves the metal black due to the iron oxide being changed to iron phosphate [don't quote me on that I ain't no chemist ;D] the tumbler worked well and left the metal clean with a matt steel finish.
Thanks for all suggestions.
Ron
|
|
|
|
Post by Tel on Oct 26, 2006 10:09:09 GMT
Yo Ron, that must be caused by the other ingredients in the products. I use pure food grade phosphoric (I 'inherited' about 300 litres of the stuff some years ago) at about 10% in clean water and it will leave 'em shiny. Don't, on any account, use a mix that has been previously used on brass or copper, unless you want 'em to come out copper colour.
|
|
