The main component of the anti-rust paint is the anti-rust pigment box film-forming substance. It is usually named after the name of the anti-rust pigment, such as: red rust paint, iron red rust paint and so on. If it is divided by its anti-rust effect, it can be roughly divided into four categories: physical anti-rust paint, chemical anti-rust paint, electrochemical anti-rust paint, and comprehensive anti-rust paint.
1. Physical anti-rust paint
This kind of anti-rust paint has no chemical or electrochemical reaction with the surface of the coated metal, and its anti-rust effect has two aspects:
1) Chemically stable inert pigments and fillers that are insoluble in water and are not easily decomposed by corrosive media, the layers themselves are relatively stable; the particles of these pigment fillers have a good filling effect, and the surface defects are less, making the structure of the layer very Dense, not only the strength is increased, but also some pigment fillers can reduce the transmission speed of water, oxygen and ions to the paint film when used.
2) Some rust-proof paints use fine scaly materials as the main pigment.
Physical anti-rust pigments mainly include: iron red, natural iron red, micaceous iron oxide, aluminum powder, graphite powder and fine glass flakes.
2. Chemical anti-rust paint
Chemical anti-rust paint is the main type of anti-rust paint. They use a variety of chemically active pigments, relying on chemical reactions to change the properties of the surface and the characteristics of the reaction products to achieve the purpose of rust prevention.
The main varieties of chemical anti-rust pigments are: lead pigments, chromate pigments, phosphate pigments, and organic phosphate pigments.
3. Electrochemical anti-rust paint
According to the electrochemical corrosion theory, the anode that is corroded in the corrosion cell is a negative electrode. If the layer coated on the metal has a lower electrode potential than the metal, then in the presence of chemically corrosive conditions, the layer is the anode and the metal is the cathode without being corroded, which is the basis for the design of the cathodic protection layer. The most widely used is zinc-rich primer.
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