The function and characteristics of epoxy zinc rich primer are mainly related to its composition, including epoxy resin, zinc powder, solvent, auxiliaries and so on. Each ingredient has a different role, in which zinc powder plays an important role in corrosion protection. Then the following is a detailed explanation of the function of epoxy zinc-rich primer, we hope it will be helpful to everyone!
1. Shielding and corrosion inhibition
Epoxy zinc rich primer paint has cathodic protection, in which zinc powder sacrifices cathodic protection anode through the principle of electrochemical reaction. Zinc is an active metal. When the corrosive medium invades, it preferentially participates in chemical reactions and forms an anti-corrosion coating. It has a good shielding and corrosion inhibition effect to protect the substrate from corrosion.
2. Adhesion
The paint film has good adhesion to the sandblasted substrate, the coating is not easy to fall off, and the adhesion is firm.
3. Solderable
The epoxy zinc rich primer paint has weldability, and the paint film can be welded at a certain thickness without affecting the welding performance.
4. Supporting role
As a heavy-duty anti-corrosion primer, epoxy zinc rich primer paint can form a matching system with a variety of intermediate paints and topcoats. The coating has good compatibility and makes the entire anti-corrosion coating play a better role.
Epoxy zinc rich primers are widely used in various fields because of their good functions and properties.
Epoxy zinc-rich primer is a widely used anti-corrosion primer, and it can be said that it has its presence in various heavy-duty anti-corrosion schemes. When using epoxy zinc rich primer paint, it is necessary to understand its coating rate and dosage, so as to avoid the problem of insufficient paint or too much purchase in actual construction. Let's analyze the construction parameters of epoxy zinc rich primer paint.
1. What is the dosage of epoxy zinc rich primer?
As far as the epoxy zinc-rich primers currently on the market are concerned, there are many types. This type is the difference in zinc content. After all, zinc content is an important factor affecting the price and effect of epoxy zinc-rich primers. Here we analyze and compare according to the national standard 70% zinc content and the commonly used epoxy zinc rich primer with 50% zinc content.
It can be said that the coating rate and dosage are similar. In order to compare the coating rate and dosage of two epoxy zinc rich primers with different zinc contents, other factors must be determined, including the number of coatings, the effect of substrate treatment, the thickness of the paint film, and the construction method.
2. Take the construction of epoxy zinc rich primer as an example:
In the actual construction of the paint, the steel structure substrate is cleaned to sa2.5 level by sandblasting, and the roughness of the metal surface is 30-75um. The construction method can be airless spraying, brushing or roller coating, and the number of layers is different. Airless spraying is enough, brush 1-2 coats. Here is an example of brushing 1 coat. The spray thickness of the paint film is 120um, and it is 60um after drying.
According to the above-mentioned comparison standard, the coating rate of the national standard 70% zinc-containing epoxy zinc rich primer is 270g/㎡, while the coating rate of the 50% zinc-containing epoxy zinc rich primer is about 170g/㎡.
Through the above comparison, we can see that the higher the zinc content, the more the average dosage per square, and the higher the cost. Therefore, when choosing an epoxy zinc rich primer, it is necessary to balance the cost and effect according to the actual anti-corrosion requirements, and choose an epoxy zinc rich primer with zinc content that meets its own construction conditions and other factors.
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