There are several phosphoric acid products available. I think "Killrust" or similar is the best product. Empty tank & flush with a high pressure water blaster (remove petrol taps first). Lay in hot Aussie sun for a day.
Plug tap holes with cork or wax. Pour about 500 ml of the antirust solution into tank & wear safety glasses & acid resistant gloves. Put petrol cap on tank & GENTLY slosh around for 10 minutes. Repeat the agitation a couple of times, remembering to turn tank in 360º in all directions. Drain into a suitable container. Lay out in hot Aussie sun for a day. Job done! If you want to be really keen (over $100) use POR15 or KREEM tank treatment. These products are great if there is a pin prick hole somewhere BUT a waste of money if you just have a mild rust problem. The killrust treatment can be repeated every 3 or 4 years if required. The phosphoric acid converts Ferrous oxide to Ferric oxide (I think) then leaves a polymer coat that inhibits further oxidation (rust). Anyway what you are doing is the opposite of oxidation (Loss of electrons) called Reduction (donation of electrons). End result is a neutral metal.
Amazing what you can remember when you put the brain into gear!!!
I've done the pressure washing of the tank.How much is the postage to 'Hot Aussie Sun'? and can I have it back for a run on new years day?.John(whinging pom) in dull dismal Suffolk .
Ferric oxide is better known as rust. Phosphate treatment is a prior to paint or coating, the finishing process applied soon after the treatment. If left as is, will need a de-watering oil applied to stop further rusting, this will occur in a very short time.
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