Have you wondered where the rust from Evapo-Rust goes?

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Time to remove the Evapo-Rust and clean out the ultrasonic cleaner after cleaning the Model B transmission parts

Sludge and residue in the bottom of the ultrasonic cleaner

A lot better
Well worth it for the results

One thought on “Have you wondered where the rust from Evapo-Rust goes?”

  1. Bill McCoskey – I was born with a greasy wrench in my mouth instead of that silver spoon. My parents and their friends all said I could tell them make, model and even year of most cars by the time I was 5. I bought my first car [1948 Packard] at age 14, and by the time I had a driver's license, I had 2 more Packards. My education was electrical and electronics engineering, but also having ADHD, I realized it just wasn't going to be a good idea to sit behind a desk 5 days a week. After school, The US Army decided to draft me, sending me to mechanics school. On arrival in Central Germany, I discovered the attraction to rare and unusual European cars. Once back in the USA, I started my own antique car business, and I've owned, bought and sold over 1,500 vehicles to date. My interests tends to run towards the rare and unusual, 1930s thru 1970s. Auto Union SP1000 to Tatra V8, Studebaker Golden Hawk to Rolls-Royce Cloud I, 1938 Ford convertible sedan to 1959 Cadillac Eldorado convertible, my tastes are pretty eclectic and wide ranging. My profile photo is me behind the wheel of the 1956 Packard Predictor, at the National Studebaker Museum.
    Bill McCoskey says:

    first I should tell everyone I’m not a chemist or a chemical engineer. Evapo-Rust utilizes a chemical conversion known as Chelation. Rust is the product of oxidation of ferrous metals, and the oxidation is what we know as rust. Chelation is the reverse action of the oxidation process.

    Phosphoric acid [remember Naval Jelly?] and other acidic de-rusting processes basically coat the oxidized steel or iron to chemically stop the oxidation. Mechanical processes like sand blasting physically remove the rust along with some of the good metal. Uther chemical systems including Redi-Strip, where the metal is dipped in a tank, eat away at the oxidation, down to the bare metal.

    High-solids paint like POR-15 are able to create a full cover over the rust, depriving it of the air needed to continue rusting, but it only covers, not removes, oxidation. [Rust requires 3 things to make it work: ferrous metal, oxygen [air] and moisture.]

    The Chelation process is different. It actually converts ferrous oxide back to base ferrous metal. It does have some limitations, if the oxidation is too thick it may not be able to convert all the oxides back to base metal. Cast or forged iron and steel, if coated with a light amount of rust, can benefit from the Chelation proces the best, and actually return that oxidated metal to fresh metal again [ready to rust again as well!]. If the steel or iron has a thick coating of rust, it might be better to remove the heavy rust coating [often flaky] prior to using the Chelation agent.

    When you see those freshly de-rusted parts in the photos here, the former light coating of rusted metal is still there, it’s just been chemically converted back to iron or steel. This is why there is little evidence of rusted metal sitting at the bottom of the tank. Most of that is from solvents & dirt that were not removed 100% before Chelation.

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