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tank de-rust

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mickwinf:
Ok i know it has been covered before but it is doing my head in! I have de- rusted the interior of my spare tank using phosphoric acid as recommended by Ashimoto. It works very well leaves it completely clean metal. The issue i have is it rusts again overnight, and had the same problem with my old tank. So these are the methods i have used with no success. If i flush with clean water then with petrol, it rusts. If i let dry without flushing the phosphoric acid it leaves a black tar like substance which only cleans off using more acid. I also tried swilling some diesel around and still it rusts! I don't want to line it as most people on here are dubious about them so what do i do? when the tanks are new they dont flash rust so why does it happen?

Laverda Dave:
Mick, I seem to remember (I think) Nurse Julie recommending a bit of diesel oil sloshed around the tank as it contains oil and therefore keeps it rust free. Normal petrol contains ethanol that will rust your tank as it attracts water and holds in suspension.

Nurse Julie:
Rince out with de ionised water and then swish diesel around inside the tank to create an oily layer.

McCabe-Thiele (Ted):
I have used stuff like Trustran (a rust convertor) that is like a gun blueing liquid on small items. I used Evaporust on my tank then swilled it with 2T oil. Quite a few rust convertors chemically react with the rust to form a none rusting oxide protective layer rather than removing the iron oxide from the metal thus enabling it to go rusty again.

K2-K6:
"when the tanks are new they dont flash rust so why does it happen?"

When steel is run through the roller mill to progressively bring it to it's sheet thickness it effectively ends "forged" with very high compression and, to a certain degree, refined inpenetrability as the final surface. This is generally pretty resilient to surface corrosion as it's just so compacted,  with any subsequent disturbance causing reduction of that finish whether starting with corrosion which once removed have partly destroyed that finish.  All subsequent treatments by removing rust can't reinstate that first finish status, at which point it will need some element of protection.  What that is I'm not sure in terms of effectiveness, but it can't be just left alone.

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