If the acid you have is liquid, dilute the recommended amount in water and soak the rusted items in. More importantly, it doesn’t react with the iron or the iron alloy underneath.ĭepending on the form of the phosphoric acid product you chose, the process of rust removal will be different. It doesn’t really get rid of the rust, but rather converts it into a black outer coat called ferric phosphate. Now, phosphoric acid isn’t necessarily a “ rust remover”. Since this acid can work well with light levels of corrosion, it is often used to perform light passivation, i.e. Just like oxalate, phosphoric acid is harmless to us in really small doses, but extremely harmful as a pure, concentrated substance. That might be one of the reasons that leads so many people to think that Coca-Cola is a good rust remover. Have you ever wondered why Coca-Cola or Gold Peak Unsweetened Tea have that sharp, tart taste? Well, it’s because they contain some trace amounts of phosphoric acid. Phosphoric acid is odorless and colorless, and it either appears as a transparent liquid (with 85% water) or as solid, colorless crystals. If you don’t manage to remove all of the rust, simply repeat the process.įor a more detailed step-by-step guide, check this article. Next, you let it dry up for a few hours and then rinse with water. Normally, you just need to add a tablespoon of oxalate to a cup of warm water, mix it up, and apply the solution on the rust-ridden surface. Oxalic acid is usually sold as a powder, and you can get it in pharmacies, hardware stores, janitorial shops, and even online retail. If you can, do the whole process outside, in the open and away from children. That’s why I have to stress that you need to be extremely cautious when handling oxalic acid during rust removal always wear a protective mask, rubber gloves, and a pair of safety glasses. However, in its purest concentrated form, it can be extremely toxic. Of course, the food we consume contains small amounts of oxalic acid, so it’s not harmful to us. While consuming oxalate-rich food is not particularly harmful, too much oxalate can contribute to kidney stones. This antinutrient occurs naturally in plants that we eat, including sweet potatoes, beets, kale, rhubarb, and peanuts. Oxalic acid or oxalate is known as the simplest of dicarboxylic acids. List of Acids Known to Remove Rust Effectively Oxalic Acid More importantly, most of them are biodegradable and therefore easy to dispose of after use. They might not be the best option if you need quick results, but they’re incredibly safe to handle. On the other hand, weak acids (such as phosphoric, oxalic, acetic, and citric acids) react slowly with rust. More importantly, they are really dangerous to work with and you have to take lots of safety measures. However, these acids are quite caustic and eat away at the metal underneath the rust. For instance, a strong acid in its pure form (e.g., sulphuric or hydrochloric acid) can react quickly and remove rust within hours or even minutes. In terms of rust removal, these two types of acid react differently to iron(III) oxide. On the other hand, weak acids only partially dissociate, with the formula being HA ⇌ H+ + A−. Strong acids completely dissociate, and the chemical formula for this process is HA → H+ + A−.
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