SOHC.co.uk Forums > CB500/550
de rust a petrol tank
AshimotoK0:
Wonderful stuff baking soda apart from the tank electrolytic cleaning and blasting uses. Try a little bit with cyanoacrylate adhesive (superglue). It cures up instantly and also 'gap fills' which superglue is normally useless for. My mum once rescued a child with severe burns from falling onto an open fire by treating the burns with a paste of bicarb ( need Nurse Julie to confirm if this is a known method) !
I don't think Coke has sufficient concentration of phosphoric acid to convert the rust quickly. I would try something like this. Diluted of course.
http://www.ebay.co.uk/itm/Phosphoric-Acid-1-Litre-81-48-hour-delivery-Best-Price-on-Ebay-/231316778500?pt=UK_BOI_Medical_Lab_Equipment_Lab_Supplies_ET&hash=item35db8dee04 plus a bag of sharp screws etc to slosh around with it.
On the electrolytic method I saw someone on one of the forums ( probably SOOC) using an electrode made out of a plastic pipe with lots of holes in it and the electrode wire passing down the bore of the tube. That way you never get shorting out of the power supply and ignition of any gases produced . Need to try this method myself sometime on a spare CB250K0 tank I have.
Cheers ... Ash
bike-pusher:
hairygit - I tried Coke. Trust me - it doesn't work.
Green1:
What would you recommend for a tank with fine rust spots on the tunnel.
Mick
mickwinf:
Thanks for all the replys but now more confused about what to do, I have a rusty bolt soaking in vinegar to see how it works!
AshimotoK0:
--- Quote from: mickwinf on September 25, 2014, 10:56:26 PM ---Thanks for all the replys but now more confused about what to do, I have a rusty bolt soaking in vinegar to see how it works!
--- End quote ---
Use either proper concentration of phosphoric acid (see my earlier eBay link) ( this is often supplied along with tank lining kits). Not Coke , as it's not strong enough. Or use the electrolysis method. Neither will remove good metal and if its the rust that's preventing a leak then it's a leak waiting to happen after an expensive (or time consuming) paint job.
See this link for electrolytic cleaning,
http://cb750sandcastonly.com/smf_forum/index.php?topic=1323.0
Cheers ... Ash
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