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How can anticorrosive coatings achieve protection?
Source: | Author:佚名 | Published time: 2021-07-05 | 529 Views | Share:
The anti-corrosion coating is a coating formed after drying and curing on the surface of the substrate to be coated. Its protective effects mainly include the following three types: shielding effect. According to the principle of electrochemical corrosion, the corrosion of steel must have the existence of oxygen, water and ions, as well as the way of ion flow and conduction. The paint film prevents the existence of corrosive medium and material surface, Blocking the path of the corrosive battery increases the resistance. The penetration rate of water, oxygen and ions to the paint film is different. The penetration rate of water is much higher than that of ions and oxygen. There is less direct penetration of the paint film, so their direct effect on the substrate metal can be ignored.

The anti-corrosion coating is a coating formed after drying and curing on the surface of the substrate to be coated. Its protective effects mainly include the following three types: shielding effect. According to the principle of electrochemical corrosion, the corrosion of steel must have the existence of oxygen, water and ions, as well as the way of ion flow and conduction. The paint film prevents the existence of corrosive medium and material surface, Blocking the path of the corrosive battery increases the resistance. The penetration rate of water, oxygen and ions to the paint film is different. The penetration rate of water is much higher than that of ions and oxygen. There is less direct penetration of the paint film, so their direct effect on the substrate metal can be ignored.

Spraying polyurea elastic coating combined with high-density perchloroethylene paint is the representative of the latest international anti-corrosion technology. At present, polyurea anti-corrosion coating is used by international oil pipeline companies. It is worth mentioning that spraying polyurea elastic coating is used for pipeline interface, which has excellent construction performance, and the general straight pipe can maintain good continuity and integrity, The whole pipeline system is sealed completely without joints, ensuring the overall anti-corrosion performance of the pipeline. The biggest advantage of using this coating is that the coated pipe fittings do not need to be heated, and the polyurea is an exothermic reaction during forming.

Therefore, even if the surface temperature of the pipe is very low, it can still have good adhesion with the heat shrinkable sleeve, and can be connected with the main pipe with the heat shrinkable sleeve. The performance of the emulsion paint anti-corrosion layer is good, and the peel strength is 65. The thickness of the traditional heavy anti-corrosion coating needs to be guaranteed, which has achieved the purpose of high anti-penetration and anti-corrosion. Due to the low solid content of the solvent based coating, the thickness of one-time spraying is limited. Therefore, in order to achieve the required thickness specification, more coating is usually required. Unlike the traditional spraying process, polyurea elastomer has unique rapid construction performance, extremely fast material reaction speed, spraying an area of 100 ㎡ takes only 30 min, and the construction efficiency is very high, It avoids the pollution of general coating materials during construction and the disadvantage of being affected by Huaning in the construction site, but it will increase the conductivity of the paint film. The flake pigment can shield the penetration of water, oxygen, ions and other corrosion factors in the coating, cut off the pores in the coating, and the mutually parallel overlapping scales are primed in the coating. The main flake pigments are mica powder, aluminum powder, mica iron oxide and glass scale.


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