Color coated steel sheet is a green environmental protection building material, how to choose the appropriate color coated steel plate and then cooperate with the appropriate pressure plate design, can not only meet the safety factor of the building, but also reduce the project cost. How to correctly select materials, rational use, improve the service life of color coated steel plate is the most concerned problem of the majority of owners and project builders. So today I make up for you to bring color coated plate material related knowledge, I believe that the related people in the process of material selection some more professional vision, together to see.

A. The influence of environment on material selection in different areas.

1.Temperature:

High temperature, softening coating, corrosion medium easy to adhere to. Easy to permeate to the substrate, high temperature water oxygen content will increase, corrosion speed at a certain temperature.

2.Humidity:

The base plate corrosion at the incision and machining damage is electrochemical corrosion, and low humidity is not easy to form a corrosion battery.

3.Diurnal Temperature Variation:

In addition, the large temperature difference will lead to frequent cold and hot deformation of the coating, which will accelerate the aging of the coating loose, and the external corrosion medium is easy to permeate to the substrate.

4.Duration and Intensity of Sunshine

Sunlight is an electromagnetic wave, which is divided into Y-ray, X-ray, ultraviolet, visible, infrared, microwave and radio waves according to their energy and frequency.Waves and radio waves have low energies and do not interact with matter.Infrared is also a low-energy spectrum that can only stretch or bend the chemical bonds of materials, not break them.Visible light abounds in color.UV ultraviolet spectrum is a high - frequency radiation, it is more destructive than low - energy spectrum.As we know, dark spots and skin cancer are caused by the sun's ultraviolet rays.In the same way, UV can break the chemical bonds of substances, breaking them.It depends on the wavelength of the UV and the bond strength of the material.X-rays are penetrating, breaking chemical bonds and producing free, charged ions, all of which are deadly to organic matter.Therefore, it can be seen from the above that the duration and intensity of sunshine affect the structural stability of the coating, especially in areas with strong ultraviolet rays.

5.Rainfall and acidity of rainfall

High rainfall acidity is definitely not good for corrosion resistance. However, rainfall has a dual effect. On wall panels and roof panels with large slopes, rainfall has the effect of cleaning the steel plate surface and washing away corrosion products from the surface. However, for low-slope roof panels and areas with poor drainage, the rainfall is large. Easily cause increased corrosion.

B. The influence of construction design on the service life of color coated steel plate

1.Installation or Producing Quality

It is mainly reflected in whether the coating is damaged during processing,whether the coating is brittle under low temperature when processing, when the steel plate is dragged to cause damage, when the installation of the structure welding iron scrap fell on the coating, the construction is not clean roof, etc.This will cause corrosion of the material.

2.Connect Way

①The connection way generally has the overlap, the bite edge and the buckle and so on kind.

Fastener material selection requires that its corrosion resistance is better than color coated steel plate, otherwise interface corrosion and wear out quickly.

Secondly, the quality of sealant also to ensure, because sealant is also organic polymer material, long-term use will also age, affect the sealing performance, resulting in fasteners and steel plate corrosion loop.

②In addition, the joint is not the tighter the better (of course, do absolutely seal is the best, in fact, leaving the gap width greater than 0.5mm is the best, so you can prevent capillary phenomenon, of course, if there is wind action, capillary phenomenon is more serious).

C.Use of environmental classification and material selection recommendations.

1.In the high altitude (southwest and northwest) and low latitude areas (guangdong and south of the region) considering color coated steel plate should choose superior durability coating (PVDF coating, HDP coating, SMP coating, etc.).

2.In the seaside use of color coated steel plate, the need for a thick coating of color coated steel plate or coating fairly dense coating varieties.Because of the strong permeability of chloride ions in seawater, it can directly corrode the substrate coating through thin coating or non-dense coating.Of course, the substrate must be galvanized or aluminized zinc material.

In the place where seawater can splash, it is not recommended to use conventional color coated steel plate, in order to deal with this harsh environment, it is recommended to use the most durable high-performance coating, such as, HDP coating, PVDF coating, aluminum.

Wiskind has cooperated with a great number of international steel brands, such as, Bao Steel, Ma Steel, Blue Scope, YPH, etc. We can make corresponding recommendations according to your different environmental requirements and use requirements.