How to do the anti corrosion treatment of steel plate?

Hot-dip galvanizing can be used.

The way is to do anti-rust and anti-corrosion treatment for steel plates. First, the steel plate is washed, pickled and washed again, and then the plating solvent is immersed, and then the steel plate is heated to 600 degrees Celsius.

In the molten zinc melted at high temperatures, the molten zinc adheres to the surface of the steel plate to form an anti-corrosion protective film. According to the thickness of the steel plate to set the thickness of the zinc layer, and then the steel plate is finished, cooled, passivated and dried and other processes, and finally carried out strict inspection, this method has a long durability, dense and uniform coating, strong adhesion, no organic inclusions and stable quality, generally used in the environment with serious atmospheric corrosion. 1. Coating method.

A good coating relies on thorough rust removal. Fluorocarbon coatings are commonly used at present.

The anti-corrosion life can even reach 50 years, so it is used for more anti-corrosion in wrought iron. It has a low cost at a time, but it is expensive to maintain when used outdoors. The first thing to do in the construction of the coating method is to remove rust.

Therefore, the coating with high requirements is generally used to remove rust with sandblasting shot blasting to expose the luster of the metal and remove all rust and oil stains. The coating applied on site can be removed by hand. The choice of coating takes into account the surrounding environment, and different coatings have different tolerances to different corrosion conditions.

The application of the coating should have the appropriate temperature and humidity. The construction environment of the coating should have less dust, and there should be no condensation on the surface of the component. Do not get wet in the rain within 4 hours after painting.

Coating is generally done 4 to 5 times. At sea or at sea or in a highly corrosive atmosphere, the total thickness of the dry paint film can be thickened.

2. Hot-dip galvanizing.

Hot-dip galvanizing has a long durability, a high degree of industrialization and stable quality. Therefore, it is widely used in outdoor steel, which is severely corroded by the atmosphere and is not easy to maintain. Such as a large number of transmission towers, communication towers, etc.

The first process of hot-dip galvanizing is pickling and rust removal, followed by cleaning. If this process is not complete, it will leave hidden dangers to corrosion prevention, so it must be dealt with thoroughly. Hot-dip galvanizing is carried out at high temperatures.

For tubular members, the ends should be open. If the two ends are closed, the air in the pipe will expand and the head plate will burst, resulting in safety accidents. If one end is closed, the flow of zinc liquid is not smooth, and it is easy to accumulate in the tube.

Hello, you can refer to the following case, the steel plate first needs to be derusted and sanded, so that the steel plate is exposed to the iron surface, and then the zinc-rich paint with high zinc content is used for painting.

All that is needed is embalmed.

Grinding and treatment: floating rust on the surface of the steel structure, etc.

Apply cold galvanized paint with high zinc content.

Construction completed.

The commonly used method is to brush anticorrosive paint, then brush other topcoats, and then there are anticorrosive layers such as zinc and chromium on the surface of the steel plate.

Paint anti-corrosion (1) anti-corrosion principle: pure zinc powder is dissolved in solvents, additives and film-forming substances to form a zinc-rich primer, which is brushed on the workpiece to be pre-corroded, and solidified on the surface of the workpiece with the help of film-forming substances. On the one hand, it isolates the corrosive medium from soaking the steel and achieves the anti-corrosion effect, and on the other hand, the zinc-rich paint has a cathodic protection effect. (2) paint coating performance zinc-rich paint is an anodic coating, but because its film-forming substance is organic matter, with the extension of time, the environment is ever-changing, organic matter will eventually age, pulverization until failure, which will lead to the oxidation and shedding of zinc powder particles; On the other hand, because the surface of the matrix after pickling and passivation is smoother, the adhesion of zinc-rich paint decreases, and it is difficult to obtain the actual anti-corrosion effect.

Hot-dip galvanizing (1) anti-corrosion principleHot-dip galvanizing is the plating process of immersing the workpiece to be plated in the molten metal zinc tank, so as to form a pure galvanized layer on the surface and a zinc alloy coating on the sub-surface to achieve the protective effect of steel. (2) Hot-dip galvanized layer performance The hot-dip galvanized coating is relatively dense, which can effectively hinder the corrosion medium from immersing the human matrix and realize the cathodic protection of steel; The hot-dip galvanized coating is thinner, generally only 30-50um, and can reach 85um for some larger workpieces, even if the dipping time is extended, the thickness of the zinc layer does not increase much, and the coating is uneven at the same time, and the thickness is not easy to control; The coating adhesion is poor, slightly better than that of zinc-rich paint. In addition, the adhesion of hot-dip galvanized coating is directly affected by the quality of surface pretreatment of the workpiece. The anti-corrosion life of a single hot-dip galvanized coating is longer than that of zinc-rich paint, which is mainly determined by the thickness of its coating.

Arc spraying anti-corrosion (1) anti-corrosion principle: arc spraying is the use of special spraying equipment, so that the sprayed metal wire is melted under the action of low voltage and high current, and the compressed air is sprayed to the metal components of pre-sand throwing and rust to form an arc spray zinc and aluminum coating, and the anti-corrosion sealing coating is sprayed on it to form a long-term anti-corrosion composite coating. The metal spray coating acts as an anode to cathodic protect the steel components, and the thicker coating also prevents the corrosive medium from infiltrating the human matrix. (2) The coating characteristics have high adhesion, and its adhesion is incomparable with zinc-rich paint and hot-dip galvanizing.

In addition, according to the Japanese industrial standards for the arc spraying coating impact bending test, etc., the test results are not only fully in line with the standard, but also by the field engineering and technical personnel called "laminated steel plate", very suitable for the long-term anti-corrosion treatment of coal mine shaft steel structural parts that are often subject to impact and vibration; Long life, arc spray coating thickness determines the corrosion resistance life of the coating, generally more than 30-60 years.

Galvanized and epoxy resin steel bars can be anti-corrosion.

Protective methods.

The steel structure is often sprayed with zinc or aluminum, and the weighted corrosion coating forms a long-term anti-corrosion structure, or the supporting heavy anti-corrosion coating is used for protection. Metal zinc and aluminum have great resistance to atmospheric corrosion. Zinc or aluminum are sprayed on the steel components, zinc and aluminum are negative potentials and steel form a sacrificial anode protection effect, so that the steel is basically protected.

At present, aluminum spraying coating is used to prevent the corrosion of the industrial atmosphere and marine atmosphere, and its characteristics are as follows:

1) The aluminium spray coating has a firm bond with the steel matrix, a long coating life, and good long-term economic benefits;

2) The process is flexible, suitable for the long-term protection of important large-scale and difficult-to-maintain steel structures, and can be constructed on site;

3) Spraying zinc or spraying aluminum coating and anti-corrosion coating sealing, can greatly extend the service life of the coating, from the theoretical and practical application effect, zinc spraying or spraying aluminum coating is the best bottom layer of anti-corrosion coating. The protective life of the composite coating of metal spray coating and anti-corrosion coating is longer than the sum of the life of metal spray coating and anti-corrosion coating protective layer, which is several times the life of a single coating protective layer.

Heavy anti-corrosion long-lasting coatings consist of a primer, an intermediate coat and a topcoat.

In terms of long-term economy, the sprayed aluminum coating is the most economical, but the one-time investment is large, and the well-applied coating can be repaired for 10 years. Epoxy zinc-rich primer + epoxy micaceous iron intermediate paint and acrylic polyurethane long-term protection system have better economy.

The anti-corrosion of steel structures requires a complete set of solutions: steel anti-corrosion measures, and the best effect is to paint fluorocarbon paint.

First of all, the steel needs to be derusted and then polished, and then coated with epoxy zinc-rich primer to isolate the air to prevent re-oxidation and rusting. At present, the best anticorrosive paint is fluorocarbon material. In the next step, the fluorocarbon primer and fluorocarbon topcoat do the final anti-corrosion treatment.

Generally speaking, the anti-corrosion, weather-resistant, and salt-spray resistant effects of fluorocarbon paint will reach 15-20 years.

It depends on what you're using it for and what corrosive things you have.

Steel should be coated with a special anti-rust paint, and be careful not to touch salt water in daily life, because salt water is corrosive.