SOHC.co.uk Forums > CB500/550

Tank derust advice please.

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Sesman:
This product. Others are available…..

Seamus:
Friend of mine did his tank by electrolysis. Worked really well using washing soda and a battery charger

AshimotoK0:
I would be really careful with acetone if the tank isn't to be repainted.
I have used De-OxC successfully in the past but it really depend on whether there is varnish in the tank from old fuel.  I have removed this with hot strong caustic soda solution but of course solvent if you don't care about the paint being damaged.

Sesman:
Thanks Ash. Care noted. I had no choice as the tank was filthy and much debris had been passed to the carbs :'(

The acetone process is over and I’ve moved on to the DEOX-C stage. What came out during the acetone stage was woeful.

I’m being as careful as I can be. Precautions include a liberal coating of grease, followed by liberal spraying of WD40 before wrapping in several layers of cling film with liberal and regular WD40 overspray. I put some on the tank too :D ;D ;D. I also placed two condoms  over the filler neck and bound the neck with string soaked in WD 40 then clipped the ends off to provide a make shift anti spill filler and drain. Seems to have been effective so far.

Like I said,I have no choice.

McCabe-Thiele (Ted):

--- Quote from: deltarider on November 03, 2021, 08:54:52 PM ---I wonder what deionised water is. Demineralized?

--- End quote ---

Deionised or demineralised water is essentially the same thing. It starts with what is generally tap water that has been filtered through an electrically charged  ion exchange resin to remove the bulk of the various soluble impurities. As it sounds the resin exchanges contaminant ions for less harmful ones it's usually pH neutral (pH7). The resin works a bit like a molecular seive blocking the larger molecules from passing through replacing them with smaller like charged ones. Like most things it is graded for pharmacutical use they use high grade stuff to reduce impurities to as close to zero as possible - what you buy for domestic use is still pretty good.

There is also RO (reverse osmosis) water it's essentially a less pure form of demineralised water, lastly there is distilled water - a final condensate when you distill water in a distillation column - this is essentially like steam condensate. Its a complex process as the final product will try to pick up contaminants from the equipment used, the storage vessels and from the atmosphere. 

One way of looking at is that deionosed or demineralised water is a highly polished version of RO water to confuse the situation more some commercial grades of demineralised water might actually be less pure than high grade RO water. It mostly depends on the end application as to the right one to use.

When I worked in an analytical laboratory in 2008 we used what was labelled as distilled water - it was in fact high grade demineralised water.

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