Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Herein lies the problem for us newbies who need to de-rust a tank for the first time - so much conflicting info everywhere...
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
Wouldn't making the tank itself the sacrificial anode ultimately weaken the tank?
Quote from: K2-K6 on March 24, 2019, 05:49:40 PMI 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.I started to read that and my brain said "Sod this, I'm going on holiday"
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.