The coating is applied to the surface of the object to be coated and works by forming a thin film. As far as the object to be coated is concerned, the function of the coating mainly includes the following aspects: ① protection; ② decorative function; ③ special function.
1. Protection
The main function of anti-corrosion coatings is protection. Whether in atmospheric environment, immersion environment or other special corrosive environments, objects will be attacked by corrosive factors such as solar ultraviolet rays, water, oxygen, chemical atmosphere, chlorine-containing atmosphere, sea water, chlorine-containing solution, etc., resulting in metal corrosion and concrete deterioration , wood rot and degradation of material properties. The coating forms a protective film on the surface of the object, which can effectively protect the material from corrosion and prolong the service life.
2. Decorative function
It should be said that the use of early pigments was mainly for decoration, which can be seen from the original decorative paintings found in Egypt, France and other regions. The coating film forms a coating film of different colors, gloss and texture on the surface of the object to be coated, which can obtain a colorful appearance and play a certain role in beautifying the environment and people's lives. On the one hand, it is particularly obvious in the aspects of building interior and exterior wall coatings and automotive coatings;
In addition to the protective effect, the decorative effect of the anti-corrosion coating surface treatment system is becoming more and more important, especially in the field of large public facilities such as stadiums, airports, exhibition halls, and bridges. For example, in addition to good weather resistance and good gloss, bridge construction requires topcoats to coordinate with the surrounding environment and night lighting in landscape design.
3. Special features
In addition to protective and decorative functions, the paint has some other functions, such as marking paint for traffic, chimneys, helipads, pipelines, etc. In addition, the specially designed coating formula has special functions, such as preventing the growth of mold on the wall, preventing the growth of marine organisms in the underwater part of the hull, reducing the resistance of the inner wall of long-distance oil and gas pipelines, and preventing fires, etc. In addition, there are various coatings with special functions such as waterproof coatings, conductive coatings, insulating coatings, thermal insulation coatings, and temperature-indicating coatings.
