The derusting mechanism of rust remover, the hazards of rust remover

After the steel is soaked in the rust inhibitor, the rust remover penetrates into the steel surface along the cracks of the rust layer and the impurity layer, and dissolves and peels off the rust layer and the impurity layer. A variety of raw materials in this rust remover are adsorbed on the steel surface, rust layer and impurity layer, form diffusion double layer on the solid-liquid interface, because the charge carried by the rust layer and the steel surface is the same, thereby the mutual exclusion effect occurs, and the rust layer, impurities and oxide scale fall off from the steel surface.

The hydrochloric acid in this rust remover can clean the surface of the steel, and methenamine acts as a corrosion inhibition for the entire system and eliminates most of the acid mist and odor. Sodium dodecylbenzene sulfonate can activate acid molecules, improve the pickling effect, and increase the pickling speed. The fatty alcohol component in sodium lauryl sulfate forms a thin film on the surface of the rust remover, which completely covers the acid mist and odor of hydrochloric acid.

In addition, in order to further improve the rust removal speed and eliminate the odor, HCFA can add an activator prepared by sodium dodecyl sulfate, sodium dodecyl sulfonate, citric acid and hydrochloric acid when the rust remover is recycled. Among them, sodium dodecyl sulfonate can activate the remaining hydrochloric acid components in the rust remover. Sodium lauryl sulfate has an activating effect and is used to eliminate the odor brought by hydrochloric acid.

Citric acid neutralizes iron ions. Hydrochloric acid increases the energy of acids.

Organic eco-friendly rust remover has the following characteristics:

1. Strong and safe. This product does not contain strong corrosive toxic acids, but uses homemade synthetic acids to maintain a safe and stable acid value. In the process of production and use, there are no three wastes, no damage to clothing, in line with the requirements.

2. Simple operation and easy to use. This product can be used directly at room temperature and normal conditions, without heating and special equipment, and can be soaked in, brushed, sprayed and other construction processes, without the need for professionals.

3. The cost is economical and the cost is low. The use can greatly reduce the equipment investment and labor investment, so that the treatment before painting is efficient, low consumption and easy.

4. Wash once without water, green and pollution-free, fast rust removal, no damage to the matrix, avoid hydrogen embrittlement, and not easy to return to rust.

Rust removal process:

1. Pour the rust and rust inhibitor into the trough, and then soak the items to be rusted, and you can take it out after a few minutes.

2. This product has advanced technology, simple, fast and efficient production method, in addition to the rust removal function, it also has the anti-rust function.

A kind of high-efficiency rust remover prepared by a variety of organic acids (vegetable acid, citric acid and edible phosphoric acid), complexing agent, permeation agent, corrosion inhibitor, surfactant, water and thickener and other raw materials. Compared with the traditional pickling rust remover, there are many advantages, environmental protection, pollution-free, non-toxic and harmless, no corrosion of steel bars, only reaction to rust, does not affect the performance of steel bars, and can also improve the adhesion of steel bars to concrete, no washing.

Summary. Rust removers can produce a large amount of residue, which not only seriously corrodes industrial pipelines, but also pollutes the soil and the environment. Traditional chemical rust removal usually uses strong acids, which can chemically react with rust and metal oxides to form soluble salts, so as to achieve the purpose of rust removal.

At the same time of rust removal, the acid can react with the base metal to release hydrogen, and hydrogen energy can exert pressure on the rust and insoluble oxide scale, which is conducive to their peeling and the reduction of iron, and accelerates the pickling process.

However, the traditional acid treatment method also has obvious drawbacks: that is, the generation of a large amount of hydrogen in the treatment process will cause hydrogen embrittlement in the steel, causing the mechanical properties of the metal to decline, and affecting the strength of the steel itself; At the same time, it is easy to form acid mist, which affects the health of operators and corrodes the surrounding equipment and environment; The consumption of acid is also large, increasing the cost of disposal.

Hazards of rust removers.

Hello, I'm the co-teacher of Tianyu Culture Media Emotional Assistant No. 003, <>

<> have been in this industry for 8 years now and are happy to serve you. <>

Please wait for 2 minutes <> answer

Rust removers can produce a large amount of residue, which not only seriously corrodes industrial pipelines, but also pollutes the soil and the environment. Traditional chemical rust removal usually uses strong acids, which can chemically react with rust and metal oxides to form soluble salts, so as to achieve the purpose of rust removal. At the same time of rust removal, the acid can react with the base metal to release hydrogen, and hydrogen energy can exert pressure on the rust and insoluble oxide scale, which is conducive to their peeling and the reduction of iron, and accelerates the pickling process.

However, the traditional acid treatment method also has obvious drawbacks: that is, the generation of a large amount of hydrogen in the treatment process will cause hydrogen embrittlement in the steel, causing the mechanical properties of the metal to decline, and affecting the strength of the steel itself; At the same time, it is easy to form acid mist, which affects the health of operators and corrodes the surrounding equipment and environment; The consumption of acid is also large, increasing the cost of disposal.

The principle of rust removal is the same for both solvents, both of which are used to remove rust by hydrolysis to produce acid, as follows:

1. NH4Cl dissolves in water and reacts: NH4Cl+H2O=NH3·H2O+H(+)Cl(-).

After the hydrogen ion is generated, it reacts with rust: 6H(+)Fe2O3=2Fe+3H2O. So that the rust falls off.

2. Zinc chloride dissolves in water and reacts: ZnCl2+H2O=H(+)ZnCl2(OH)](

In the same way, it reacts with rust and causes the rust to fall off.

Summary. 1. Shake the rust remover well before use, and aim the nozzle at the place where the rust needs to be removed.

2. For hard-to-reach areas, the thin tube can be used at the nozzle.

3. Use soaking, washing brush or spraying, and the soaking method is the best.

4. After rust removal, a large amount of water should be used to rinse the residue, if rust needs to be prevented after rust removal, it is necessary to rinse with a large amount of water, neutralize and passivate with 5% sodium hydroxide solution, wipe dry and then spray rust inhibitor for protection.

How to use industrial rust removers.

1. Shake the rust remover well before use, and aim the nozzle at the place where the rust needs to be removed 2. For the hard-to-reach area, the thin tube can be installed and infiltrated at the nozzle for use. 3. Use soaking, washing brush or spraying, and the soaking method is the best. 4. After rust removal, the residue should be washed with water from the ridge of the large excavation, and if rust needs to be prevented after waxing and rust removal, it is necessary to rinse with a large amount of water, neutralize and passivate with 5% sodium hydroxide solution, wipe dry, and then spray rust inhibitor for protection.

Supplementary information: 2. Precautions for using rust remover 1. The storage of rust remover should be placed in a shady and cool place, and out of the reach of children. 2. After surface treatment, it will be accompanied by a layer of blunt travel coded film, with a thickness of about 1 micron, which is a reaction between a product made of inorganic acid and a steel rust remover, which can play a protective role in steel.

3. After using the rust remover for a period of time, it should float on the surface of the foam and precipitate in time, and carry out concentration test and analysis to supplement the rust remover and ensure the cleaning effect (see concentration control method). 4. The processed workpiece is neatly separated to facilitate drying. Please dry or dry the workpiece and do not rinse with water.

Spray paint or anti-rust oil as soon as possible after work. For the best results, you can choose to use the company's powerful production clean anti-rust oil. 5. Due to the rust to achieve a better effect, if it is the surface treatment of seriously corroded materials, the steel brush or other mechanical removal methods should be used to corrode, and then the rust inhibitor should be used.

If there is thick oil on the surface of the treated material, the oil should be removed first and then treated with a rust remover. 6. If the short-term contact with the product is harmless, if the long-term contact should take corresponding measures to protect the labor force (glasses, rubber gloves, wear protective clothing, rubber shoes) to ensure the safety of operators. 7. If the liquid is accidental.