Liao Jing Science and Technology will answer for you: Anti-corrosion is to protect easily rusted metal objects by various means, so as to achieve the purpose of prolonging their service life. Physical corrosion protection, chemical corrosion protection and electrochemical corrosion protection methods are usually adopted.

The common anti-corrosion methods of metal parts include oxidation method, phosphating method, electroplating method, spraying plastic coating method and brushing anti-rust paint method. The first few are generally used in the manufacturing process of parts, and only the method of brushing antirust paint is introduced.

In the antirust work of metal parts, the method of brushing antirust grease is simple and practical. There are many kinds of finished anti-rust oils in the market, including anti-rust oil, antirust grease, dual-purpose grease for anti-rust and lubrication, gas phase corrosion inhibitor, peelable plastic and so on. , can be used according to different accessories and different protection requirements.

Heavy-duty anticorrosive coating is a special coating technology with high corrosion resistance. The film thickness is above 200 ~ 300 microns, and the anticorrosion period is as long as 10 ~ 50 years in harsh corrosive environment. Because of its extremely long anticorrosion period, it is also called long-acting anticorrosive paint.

The remarkable feature of heavy-duty anticorrosive coating is its film thickness. In order to achieve corrosion protection for decades, thin coatings are difficult to be effective. Developing high corrosion-resistant resin and new pigments and fillers is the premise of realizing heavy-duty anti-corrosion painting. Careful cleaning of metal substrate surface is the basis of heavy-duty anti-corrosion coating. Scientific coating design requirements, coating matching scheme and coating construction technology are the key to heavy-duty anti-corrosion painting, and strict quality inspection and maintenance management are the guarantee to realize the effect of heavy-duty anti-corrosion painting.

The particularity of anticorrosive coatings puts forward special requirements for heavy-duty anticorrosive coatings. Mainly:

Corrosion is a serious problem in flue gas desulfurization system, and it is also a difficult problem that must be solved in flue and chimney. The following four anti-corrosion materials are mainly used for chimney and flue corrosion protection in the world and China:

Fiber reinforced plastics (FRP)

⑴ FRP is resistant to chemical corrosion, and its cost is lower than that of high nickel alloy, so many wet separation system devices choose FRP, and good results have been achieved. According to foreign data, FRP has been successfully applied in the following aspects of wet desulfurization system: absorption tower, lime dissolving tank, liquid collector, demister, slurry conveying pipeline, flue chimney and so on.

⑵ Because the inner surface of FRP is smooth, difficult to scale, wear-resistant and acid-resistant, it usually works well in areas with high flow rate and high particle concentration. The common FRP series anticorrosive materials in the domestic market are: epoxy resin, modified OM special anticorrosive paint.

rubber

Silicone rubber-polyurea is common in domestic market. However, this product is not resistant to high temperature and has excellent waterproof and acid resistance, which is not conducive to long-term direct discharge of coal-fired units.

Glass phosphorus sheet

Because the main filling material of glass flake is silicon dioxide, its temperature resistance and acid resistance are very good. More common in the market are: foam glass bricks and glass scales.

Acid resistant cement

(1) has good adhesion to metal matrix and various coatings, and good physical and mechanical properties;

⑵ Good corrosion resistance to various corrosive media;

(3) The construction is convenient. Synthetic resins suitable for manufacturing heavy-duty anticorrosive coatings include various types of epoxy resin, polyurethane vinegar, acrylic acid, chlorinated rubber, organic fluorine resin, unsaturated polyester resin, etc., which have high corrosion resistance.