Color Steel Plate Knowledge
- May 30, 2018 -
On continuous unit with cold-rolled strip steel, plated zinc strip steel (electric galvanized and hot dipped galvanized) as substrate, after surface pretreatment (skim and chemical treatment), with the method of the roller coating, coated with a layer or multilayer liquid coating, after baking and cooling of the proceeds of the plate is the coating on the steel plate.Because coatings can have a variety of different colors, it is customary to call coated steel plate color coated steel.Because the coating is carried out before the steel plate is formed and processed, it is called precoated steel plate in foreign countries.
The process flow
Color coating steel is cold rolled steel sheet and galvanized steel substrate, after surface pretreatment (degreasing, cleaning, chemical conversion treatment), with the method of continuous coated with paint (roller coating method), after baking and cooling and manufactured products.
The main production process of the common two-coating two-layer continuous color coating unit is: uncoiling, pretreatment, coating, baking, post-treatment and coiling.
Coating on the steel plate has a light weight, beautiful and good anti-corrosion performance, and can be directly processed, it to construction, shipbuilding, automobile manufacturing, furniture industry, electrical industry provides a new type of raw materials, such as the steel for wood, such as efficient construction, save energy and prevent pollution.
Use galvanized steel plate as the base plate of color coating steel plate, in addition to have the protection of the zinc, zinc layer of organic coating on the cover isolation function, can prevent the steel rust, longer service life than galvanized steel sheet, according to the service life of the coating on the steel plate to 50% longer than galvanized steel.
However, in different areas and different parts of the use, the use of the same amount of zinc, the same coating, the same coating thickness of color coating plate, its service life will be very different.For example, in industrial or coastal areas, the corrosion rate is accelerated and the service life is affected due to the effect of sulfur dioxide gas or salt in the air.In the rainy season, the coating will be corroded quickly and its service life will be reduced if it is soaked by rain water for a long time or if the temperature difference between day and night is too large to be exposed.Buildings or factories made of colored coated steel sheets are often subjected to long service life when washed by rain; otherwise, they are affected by sulfur dioxide gas, salt and dust.Accordingly, when designing, if the inclination of the roof is bigger, more not easy to accumulate dirt and other filth, service life is longer;For areas or areas that are not frequently washed by rain, they should be washed regularly with water.