There are many factors that affect the corrosion resistance of the color coated plate, including the type, thickness, type, level and thickness of the coating, the environmental conditions for use, and the mechanical processing, transportation, storage,
construction, installation and maintenance after construction. Today we mainly talk about the base plate, coating types and the use of environmental impact on the corrosion resistance of color coated plate!
Type of substrate
The corrosion resistance of the substrate mainly includes:
A. corrosion resistance of bare plate B. corrosion resistance after forming C. edge cutting sacrificial protection
These three properties vary with the substrate
At present, the commonly used ones in China are as follows:
A. hot dip galvanized steel plate B. electro galvanized steel plate C. hot dip galvanized aluminum steel plate D. hot dip galvanized alloy steel plate zinc and aluminum have
high stability in most atmospheric environments.
Zinc will form thin and dense corrosion products (zinc oxide, zinc oxide, alkaline salt) with strong adhesion in the corrosion medium. These products shield the surrounding medium and prevent further
corrosion. In addition, the electrode potential of zinc is negative than that of iron, which belongs to anode coating. It has the protection function of sacrificing itself. Under the same environmental conditions, its life is directly proportional to
the adhesion of zinc coating. The service life can be increased by increasing the thickness of the zinc coating. In a certain limit thickness, the process of hot-dip galvanizing is relatively easy to achieve. However, due to the limitation of technology,
the thickness of zinc coating is very thin, generally up to 18G / m2, and the domestic production is 15g / 15g double-sided, so it is not suitable for outdoor use.
Hot dip aluminizing zinc is another kind of common metal coating, because the aluminum
surface is easy to form a dense alumina layer, in the same environment, its corrosion resistance is more than twice that of hot dip galvanizing. The oxide film of aluminum is very stable and plays the role of isolation film. It also has excellent anti
sulfide properties. Aluminum zinc alloy can obtain thick, dense and water-insoluble non active oxide film on its surface, thus preventing further oxidation. At the same time, because the potential of aluminum zinc alloy is slower than that of zinc, the
electrochemical corrosion rate of aluminum zinc alloy is slower than that of pure zinc. At the same time, after scratching and shearing, zinc provides sacrificial cathodic protection at the edge of the alloy, which greatly improves the corrosion resistance
of the color coated plate.
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