20kg/ barrel, the theoretical dosage is 150-250g/m, usually the thickness of dry film for secondary coating is 55-5 microns, the barrel is 100 square meter, and the price is between 380-430 yuan/barrel. There are several grades of antirust paint, such as single or double grade, epoxy red lead antirust paint, alkyd antirust paint, epoxy paint, etc. It depends on your environment, budget and other factors. There are many factors that affect the price of solid wood preservatives. Besides, there are many things in it, not just the price.
The type of electrochemical antirust paint, if the electrode potential of the coating on the metal is lower than that of the metal, then in the case of electrochemical corrosion, the coating is the anode and the metal is the cathode. At present, epoxy zinc-rich primer and aluminum antirust coating are the main materials, and epoxy zinc-rich primer is the most widely used one at present.
The anode is zinc and the cathode is iron. Epoxy zinc-rich primer is a conductive protective layer formed by attaching a large amount of zinc powder to the surface of steel with adhesive. For example, epoxy zinc-rich primer requires high treatment of metal surface, which will not only affect the adhesion of coating, but also hinder the effective contact between coating and metal. However, from the perspective of repainting time and construction cost, it is economically reasonable.
Types of chemical anti-rust coatings, chemical anti-rust coatings are the most commonly used types of anti-rust coatings at present. They use various chemical pigments to change their surface properties and the properties of reaction products through chemical reactions, thus realizing anti-rust.
Types of physical antirust coatings include iron red, mica iron oxide, aluminum powder, glass flake, etc. This coating basically does not react with the coated metal surface chemically and electrochemically. It is an inert pigment and filler insoluble in water. It has good chemical stability and compact structure, which can reduce the permeability of water, oxygen and ions to the paint film and prevent the corrosive medium from contacting with the substrate, but the antirust effect is not obvious.