SOHC.co.uk Forums > CB350/400

Fuel Tank Cleaning

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Rob62:
Well Matt, either kev’s right and everybody else who uses this technique is wrong and it doesn’t work....or its the other way round... you decide  :)

kevski:

--- Quote from: Rob62 on March 24, 2019, 01:00:34 PM ---Well Matt, either kev’s right and everybody else who uses this technique is wrong and it doesn’t work....or its the other way round... you decide  :)

--- End quote ---
Its not about right or wrong, its  about correctly, i done this stuff for a living not as part of a hobby and that's where the difference lies, i offer suggestions based on what you might have kicking around in shed, i will also let you know the correct way it's done, but ultimately i don't have rusty tanks in any of my vehicles.

kevski:

--- Quote from: Oddjob on March 24, 2019, 04:43:01 PM ---Wouldn't making the tank itself the sacrificial anode ultimately weaken the tank?

--- End quote ---
Only if you plate out too long or the tank is done in to start with also the rust is already weakening the tank, what you are doing is taking the crap away from the tank and depositing it on the cathode, in the industry you clean using hot solvent or caustic based solutions and then it's D.I rinsed, then pickled with a 5/10% sulphuric acid rinsed again with D.I then plate up, timings are crucial,this is just a brief look at the process, naturally with tanks after the final rinse you need to dry it out quick and put protective coatings inside.

K2-K6:
I understand it as kevski states.

The steel tank that has rust is already compromised,  or beginning to be, dependant on how much rust.

From a metallurgy point of view,  steel sheet has been rolled to get it's thickness to required dimension for component pressing.  This makes it effectively close to forged and maintains a compression of the surface that is a little resistant to corrosion because of its physical structure. It's this property that fuel tanks have taken advantage of for years,  so they've never really been treated during production.

If you've left a piece of sheet that's been cut in damp conditions,  the cut edges will very quickly corrode and general surface take much longer.

Once you cut, grind,  corrode etc you loose this refined surface compression,  making it far more likely to flash corrode as you further prepare it.

Rob62:
Exactly  ;D jesus! the poor guy only wants to know how to clean his tank..... i give up ! 

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