The corrosion resistance of different types of coatings of ppgi ppgl coil is also different. For example, in the case of the same coating thickness, the corrosion resistance of hot-dip galvanized coatings is higher than that of hot-dip galvanized coatings. In addition, corrosion resistance generally increases as the coating weight increases, so the corrosion resistance of color-coated panels can be improved by using substrates with high corrosion resistance or by increasing the coating weight.
The corrosion resistance of prepainted steel coil (color coated steel coil) is closely related to the thickness of the coating. Generally, the corrosion resistance increases with the increase of the coating thickness. The appropriate coating thickness should be determined based on environmental corrosivity, service life and durability.
Coating color difference
PPGI PPGL may have color difference during production and use. Since color difference is affected by various factors such as production batch, color depth, use time, use environment, and purpose, it is usually negotiated by both the supplier and the buyer when ordering.
The gloss of the coating is mainly selected according to the application and usage habits. For example, domestic color-coated steel coils for construction usually choose medium and low gloss, and color-coated panels for home appliances usually choose high gloss.
The hardness of the coating is the ability of the coating to resist scratches, friction, collision, indentation and other mechanical effects. It is closely related to the scratch resistance, wear resistance, indentation resistance and other properties of the ppgi ppgl sheet , processing methods, storage and transportation conditions, etc.
The flexibility/adhesion of the coating is closely related to the machinability of the color-coated sheet, and the selection is mainly based on the processing method and the degree of deformation. When the deformation speed is fast and the deformation degree is large, the color-coated plate with high impact energy value and small T-bend value should be selected.
Coating durability is the performance of the color-coated sheet during use, and it is usually measured by the length of service life. Coating durability is mainly affected by factors such as coating type, coating thickness, and environmental corrosion. The true durability of coatings can be determined by atmospheric exposure testing. Durability can also be assessed by artificial aging tests. Neutral salt spray resistance test is one of the simplest and most commonly used artificial aging test methods, and UV lamp accelerated aging test is also a commonly used artificial aging test. In addition, the color-coated board may be used in special environments such as acid rain and humidity. At this time, the corresponding artificial aging test should be selected for evaluation. It should be noted that artificial aging tests usually cannot fully simulate the actual use environment.
In some cases, the color-coated board may need to have better organic solvent resistance, acid and alkali resistance, pollution resistance and other properties, and attention should also be paid to such special properties.
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