What are the methods of rust removal? The best way to remove rust

The commonly used methods of rust removal are physical methods and chemical methods.

Physical rust removal: It is the use of tools or machinery to remove the rusty material on the surface of the metal, also known as polishing and grinding method. This method can only deal with the floating rust and visible rust on the metal surface, but for permeable rust and stubborn rust, physical rust removal is easy to cause residue and easy to return to rust quickly.

Moreover, for the labor cost is high, and the rust removal effect is not very ideal. The most important thing is that physical rust removal is easy to cause dust pollution and does not meet environmental protection requirements!

The best way to remove rust is chemical rust removal: chemical rust removal is to use rust remover to deal with the rust on the metal surface, and some can remove the rust while forming an anti-corrosion layer on the metal surface.

Chemical Rust Removal:

Acid rust remover: the common is strong acid (sulfuric acid, hydrochloric acid, nitric acid, etc.), but the disadvantages are greater, easy to cause excessive corrosion, and have a certain degree of harm to human safety.

Therefore, the current trend is organic acid rust remover, which is easy to meet environmental protection requirements, does not contain strong acid, is fast to remove rust, and is easy to use. ：

It is composed of a variety of surfactants, penetrants, accelerators, organic complexing agents, etc.

It does not produce "hydrogen embrittlement", does not require high-temperature baking and special cleaning, does not cause "excessive corrosion", and has almost no "weightlessness" even if it is soaked in environmental protection rust remover for a long time, which protects the original mechanical properties and processing properties of the steel.

Neutral rust remover: pH is neutral, which can remove floating rust, rust scale, and dissolved metal oxides.

The parts that need to be derusted can be removed without disassembling or grinding. There is no damage to copper, brass, aluminum, plastic, rubber, wood, vinyl and other materials.

Rust conversion agent: completely solve the problem of secondary rust after rust removal and before coating and the problem of secondary corrosion in the short term caused by incomplete rust removal.

After rust removal, the steel parts have a certain degree of rust resistance in a ventilated and dry place.

For the problem of rust, the most suitable method should be selected according to the requirements of rust removal and the nature of the workpiece to be removed!

1. What is rust?

Ferric oxide is the main component of rust. The main cause of rust is that iron metal will rust in the presence of impurity carbon, which reacts with moisture and oxygen in the environment. It is used in paint, ink, rubber and other industries, can be used as a catalyst, glass, gemstones, metal polishing agent, can be used as a raw material for ironmaking.

The largest application of iron oxide is as a pigment, so it is more difficult to remove once it gets on clothing.

Second, how to remove rust stains.

1.Rust stains on clothing can be soaked in 1% warm oxalic acid aqueous solution, and then rinsed with water.

2.Stains can be wiped with a 15% aqueous acetic acid solution, or the stained part can be soaked in the solution and rinsed with water the next day.

3。The dirt can be moistened with 10% citric acid aqueous solution or 10% oxalic acid aqueous solution, then soaked in concentrated salt water, and then washed and rinsed with water the next day.

4.White cotton or cotton blend fabrics stained with rust, and a spoonful of oxalic acid can also be put into a basin. Add another cup of hot boiled water to dissolve all the oxalic acid, then add about half a basin of warm water to soak the rusty clothes.

After about 10 minutes, take it out, scrub it with soap or laundry detergent, and rinse it with clean water, and the rust on your clothes will be completely gone. However, it should be noted that during operation, in order to prevent oxalic acid from corroding the fabric, the operation should be carried out quickly.

5.You can use fresh lemon juice to drop on the rust stains, rub them by hand, and repeat them several times until the rust stains are removed, and then rinse them with water after washing with washing liquid.

Commonly used rust removal methods can be divided into two categories: physical methods and chemical methods.

The physical method is mainly to remove rust by grinding, such as sandpaper, grinding wheel, wire brush, steel wool ball, etc. The chemical method mainly uses acid to have a chemical reaction with rust, so as to achieve the purpose of rust removal.

Rust removal principle: The main components of common rust removers in life are hydrochloric acid and dilute sulfuric acid, which can react with iron oxide, and the reaction principle is: Fe2O3 + 6HCl = 2FeCl3 + 3H2O, Fe2O3 + 3H2SO4 = Fe2 (SO4) 3 + 3H2O. The rust remover penetrates into the surface of the steel products along the cracks of the rust layer and the impurity layer, and dissolves and peels off the rust layer and the impurity layer, so that the rust layer, impurities and oxide scale fall off from the surface of the steel products.

However, acids are corrosive, so it is necessary to wear protective clothing when removing rust. In addition, acid and iron will produce hydrogen, which will occur in case of open flame**, so it is necessary to prohibit fireworks during rust removal operations.

The above content refers to popular science China - how to remove rust, do you know?

Oxalic acid solution Waste engine oil Sulphur dioxide.

1.Take some lemons, squeeze out the fresh lemon juice, add some salt, stir well, then soak the rusty items inside, take them out after 30 minutes and brush them slightly with a brush 23. White vinegar and baking soda

Tin foil is kneaded into a ball and wiped directly on the surface of the rusty object to remove.

There are ways to remove rust:1. Manual rust removal, using hand hammers, knives, shovels, wire brushes, coarse abrasive cloth (paper), etc., to hammer, scrape, shovel and brush the corroded metal surface.

2. Chemical rust removal (also known as pickling and rust removal). Inorganic dilute acid solution is mainly used to brush (spray) and soak the corroded metal surface.

3. Rust remover to remove rust. It mainly uses a weakly acidic chemical liquid (i.e., rust remover) to brush or soak the metal in this chemical liquid on the metal surface, and produces a chemical reaction with the rust on the metal surface to achieve the purpose of rust removal.

White vinegar. Vinegar can remove rust from the surface of the metal, put the rusty metal in white vinegar, let it stand for a few hours and then wipe off the remaining rust stains. If it's too big to soak in white vinegar, pour a layer of white vinegar on top and let it sit for a while.

You can also wipe off rust stains with a rag soaked in white vinegar.

Lime with salt. First, sprinkle salt on the rusty area, then squeeze the orange juice and pour it over the salt, and finally let it sit for 2 to 3 hours, and finally scrape off the remaining rust stains, and use the lime peel to wipe off the remaining rust stains on the metal. It effectively removes the rust layer without damaging the metal surface.

If you don't have lime, you can also use lemon instead.

Baking soda paste. Take out the appropriate baking soda, add water to the baking soda and mix it into a paste, apply the baking soda paste, leave it for a while, and then scrub it clean.

Potatoes and dish soap.

Cut the potatoes in half and apply dish soap to the cut side. They react chemically with the rust layer, making it easier to remove.