High galvanizing layer means that the coating is very thick, which is for hot-dip galvanizing, because electro-galvanizing cannot be plated too thickly. The thickness of hot-dip galvanized coating is generally more than 20 microns, and can even reach more than 100 microns. The commonly used weight of galvanized layer per square meter is 145 grams/square meter, and the coating is about 20 microns. However, it is not easy to control the thickness of hot-dip galvanizing in a relatively thin range.
The melting point of zinc is 419.5°C and its chemical properties are active. In the air at room temperature, a thin and dense basic zinc carbonate film is formed on the surface, which can prevent further oxidation. When the temperature reaches 225°C, zinc is violently oxidized and white zinc oxide appears. After high-temperature barbecue, the anti-corrosion layer on the surface of the galvanized sheet is oxidized. Therefore, the galvanized sheet cannot withstand high temperatures. The heated surface will change color, or other protective substances on the surface will easily turn yellow after oxidation.
The surface of the galvanized sheet should be free of oil, wax, and other stains or dust, which can improve the adhesion of the putty;
Theoretically, it is not recommended to apply finishing paint or primer on a surface that is too smooth, such as galvanized sheets. If necessary, corrosion treatment (such as hydrochloric acid) should be performed to improve the bonding strength with putty and paint;
The putty should be adjusted according to the standard ratio and the proportion of the curing agent. Excessive proportions will reduce the adhesion and physical properties of the putty (such as excessive brittleness and loss of toughness);
The putty should be used within the shelf life and be applied as thinly as possible to prevent the temperature difference between the surface and the base galvanized sheet from being too large and causing inconsistent stress, shrinkage and expansion, causing the layer to fall off and lead to complete separation.
Analysis of the advantages of galvanized sheet materials
Galvanized sheet is a sheet with a layer of zinc on the surface. Currently, an economical and effective anti-corrosion method is used on the market, and this is galvanizing. So far, at least half of the zinc developed in the world has been Galvanizing process for sheet metal. This process can prevent the surface of the steel plate from being oxidized or corroded by liquid, extending the service life of the plate and saving a lot of manual maintenance needs.
At present, this material has been widely used in the construction industry, and it is also gradually used in automobiles, guardrails, anti-corrosion steel, etc. Traditional steel has been put into the market after simple anti-rust treatment, and its service life is only a few years. The updated galvanized sheet material has replaced traditional steel, and its excellent performance has been tested through multiple tests and user experience. It has been certified, and specific relevant information can be viewed through the data published by the manufacturer.
In recent years, several related steel materials have appeared, and their corrosion resistance, rapid prototyping, and surface coating have been greatly improved. Through the accumulation of technology, the manufacturing cost has been reduced, and the appearance has become much more beautiful. . If you want to know more about galvanized sheets, you can contact us.
