In the steel structure heavy-duty anti-corrosion coating system, the double-layer is a system with excellent anti-corrosion performance. There are many kinds of metal coatings on the surface of steel structures, such as metal thermal spraying, hot dip galvanizing and electric locks.
The composite coating heavy-duty anti-corrosion system composed of metal coating and organic coating, the most important feature is its ultra-long-term anti-corrosion performance, which far exceeds that of a single metal coating or organic coating. It can achieve 20 years of maintenance-free and 40 years of long-term anti-corrosion. Zinc spraying and aluminum spraying are commonly used metal coatings on the surface of steel structures. The basic principle is that the negative potential of zinc and aluminum forms a sacrificial anode protection effect with steel, so that steel is basically protected.
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