paul the 6th
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| posted on 14/12/08 at 08:15 PM |
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De-rusting... a few questions :)
There's been a few offers of complete chassis's for sale recently, and now an armoto flatpack chassis which is unused and no longer needed
AND has been stored for 6 months...
All of these offers have included the usual "There is some light surface rust which isn't a problem if you're having it
blasted/powder coated" etc....
I've heard about the electrolysis method for de-rusting (although I do need to do some more research since I'm not 100% on exactly how it
works) but I dont think this will be very good for chassis tubes & rails due to their size.
Am I right in thinking I'll only need to de-rust the area's where I'll be welding i.e. the ends of the tubes and anywhere else the
tubes will meet?
If it's as easy as this, will a wire brush and some sand paper be enough to remove the rust?
I've only had my welder a week and I'm still practising, so still getting the hang of it...
Thanks in advance, paul w!
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blakep82
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| posted on 14/12/08 at 08:19 PM |
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yeah, just rub the ends with fine sand paper, or wire brush. no need for electrolysis for light surface rust like that. while you're welding the
whole thing up, the surfaces will rust again anyways.
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liam.mccaffrey
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| posted on 14/12/08 at 08:21 PM |
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cant see why electrolysis wouldn't work.
I bet it would, Kiddies paddling pool and move the anode around a bit
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blakep82
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| posted on 14/12/08 at 08:23 PM |
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^ just a bit extreme for a little surface rust
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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tomblyth
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| posted on 14/12/08 at 08:25 PM |
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I agree with liam.mccaffrey but wait till after xmas to buy the pool /plastic sheet lined hole in the ground! as will be cheaper in the sales
(woolworth may have a pool cheap before it closes
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MikeR
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| posted on 14/12/08 at 08:54 PM |
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i semi seriously thought about this a while ago - the consensus was are you 100% sure your chassis is water tight. If its not you'll introduce
water into the chassis tubes that over time will rust.
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paul the 6th
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| posted on 14/12/08 at 09:14 PM |
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I think for small components with lots of nooks and cranny's, electrolysis is the way forward since it makes life so much easier. But for a
straight uniform flat surface (as with box section), a wire wheel in a grinder will make life easier, especially if I just touch up the ends and other
points where tubes will meet with welding 
Thanks for the tips 
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BenB
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| posted on 14/12/08 at 10:03 PM |
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Fill a swimming pool with molasses in a 10:1 mix. leave item in it for 48 hours. Done. No power supply, no caustic soda. Just molasses, water and
time....
I know everyone here loves electrolysis but molasses rules
Otherwise try Deox gel from bilt + hamber...
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DIY Si
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| posted on 14/12/08 at 10:58 PM |
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For flat surfaces like box section, some sand paper will do fine. Ok, it's a bit of effort, but since when did exercise hurt anyone that much?
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
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David Jenkins
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| posted on 15/12/08 at 08:50 AM |
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I'd go for a wire brush in an angry grinder, followed by preparation with something like POR-15's Metal Ready, which converts any
remaining rust to something else (phosphate?).
The only down-side to Metal Ready is that you have to rinse everything down afterwards - try not to get the water into the tubes, or do it on a hot
summer's day (like I did), or warm the chassis up afterwards.
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