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This is a natural phenomenon that chemists refer to as “carbon migration”. In certain instances, steel will darken in color after rust has been removed from the surface of the metal. Steel is composed of a combination of carbon and iron. "The black film is carbon from the steel. Here is the explanation of that from the Evapo-Rust site: If there's anything I'll put in the Evapo-Rust, run it for a few days, then look in to see if the rust is all gone.Īnother interesting thing I learned about Evapo-Rust from my research - you'll notice that there is a slight darkening of the metal after being cleaned by Evapo-Rust. Next summer, when it gets time to start worrying about overheating, I'll take the radiator hoses off of the top of the heads and look down inside to see if I see any rust or corrosion even though my engine rebuilder said he "boiled it out" just in June. of rusted steel per gallon giving additional value for the additional cost. Although the Evapo-rust costs more - $60.00 for 5 gallons compared to $25.00 for the vinegar - it can be reused over and over again for up to 300 lbs. Anything suspended in either solution will be flushed out by a good back flushing (which any filter would keep from working.) When I say "good back flushing" I mean this kind: ĥ. Neither approach creates any "chunks" of stuff that needs to be filtered out by putting some kind of filter in the radiator to keep it from plugging up. I checked them with a magnet then scraped some off (after the test was concluded) and they were nothing but solid rust.Ĥ. The thick deposits were not any kind of calcium or lime deposits. Such doesn't predict very good results in an engine block where the ratio of metal to vinegar is even higher making it even more likely that the vinegar would be neutralized before it finished its job.ģ. It wore out before it even finished the job. Three pints of vinegar was somehow neutralized by just the intake of the water pump sitting in it for a few days. I figured out later that the reason the vinegar quit working is that it lost its acidity. Acid may do some good but not enough when compared to the bad it also does at the same time. It does any and all that vinegar does and more and leaves the metal and the solution clear and clean.Ģ. The Evapo-Rust is far superior to plain vinegar. Whereas, the vinegar solution is cloudy and milky rust colored.ġ. I checked the warts with a magnet then scraped some off after the test was concluded and they were nothing but solid rust, not calcium nor lime deposits.Īnother noticeable difference is that the Evapo-Rust solution is still totally clear with just a few black particles at the bottom, probably dirt from the outside of the pump. (First picture from post # 1 before any treatment. Vinegar on the right.Īnd after a quick wipe with my finger inside of both pumps, there is no residue from the Evapo-Rust whereas the vinegar has left substantial not changed much in the last 36 hours.Īlso note that the vinegar ate the paint off of the right pump and then the metal rusted after the paint was gone. Here are the results after 4 days of soaking:Įvapo-Rust on the left. Here is the conclusion of that test for anyone interested (Post # 45) Check out this thread starting at post #30 : The Professor ("Old Henry") put this to rest a couple of years ago with a controlled, scientific test. I'd go with a blasting cabinet, or phosphoric acid, or electrolysis if you have the space to set it up (just make sure you don't do it inside, coff coff Hindenburgh coff coff Its saving grace is that it's cheap, but I never found it effective, so I don't use it. Not only does it not work as well, it also dissolves the metal object a lot quicker than phosphoric acid. The best part is, although it will eventually dissolve the metal object you put in it, the rust goes way earlier. You can also dilute it to stretch it out but that makes it take longer. About $15/gallon and keeps its potency longer. Some sort of phosphoric acid works very well - Metal Ready, Right Stuff, Ospho, Prep and Etch, all the same.
![evapo rust evapo rust](https://www.supercheapauto.co.nz/dw/image/v2/BBRV_PRD/on/demandware.static/-/Sites-srg-internal-master-catalog/default/dw1eccc37e/images/354057/SCA_354057_hi-res.jpg)
It's also expensive, like $25/gallon last time I checked. It also loses potency sitting in the jug.
![evapo rust evapo rust](https://www.wilcodirect.co.uk/userfiles/images/products/BY-EVA5LP.jpg)
It works great but needs a bit of setup and equipment and takes some time.Įvaporust works well but doesn't last long. I used that based on my previous occupation dealing with historical objects from under water. There are several ways I've used to remove rust.Įlectrolysis works great. Has anyone used apple cider vinegar with success? After 24 hours some rust has been removed but it doesn't seem to be working all that well. I am trying a test case with vinegar right now. I watched a number of you tube videos which removed rust using only apple cider vinegar. I have always used Evapo Rust with some sandblasting to remove rust from small parts.