What factors affect the quality of weather-resistant steel plate

Weatherproof steel plate in the quality of the problem, the specific factors affected by, as a weatherproof steel screen manufacturers, let me take you to understand!



First, the main factors affecting the quality of weather-resistant steel plates



There are many main factors that affect the quality of weather-resistant steel plates, such as substrate, poor quality, surface tension changes of the coating, improper pre-treatment, curing defects, coating defects and scratches. The corrosion resistance of weather-resistant steel plates can produce limited cold-rolled substrates, because any slight scratch on the surface coating will quickly appear red rust, affecting use. The color coating of this substrate can be used to make internal parts of household appliances or temporary guardrails of low height, so the quality of the weather-resistant steel plate mainly depends on the choice of substrate. In addition to the impact of raw materials on quality, the quality of weather-resistant steel plates also has a great relationship with the processing technology. In order to have good quality weather-resistant steel plates, it is necessary to ensure the technological level. Degreasing, washing, surface conditioning, drying, chemical conversion film treatment and early drying are generally sprayed or impregnated.
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Second, the reason why the weathering steel plate rusts and does not rot



Pure iron is not easy to rust, but ordinary steel usually contains impurities such as copper and carbon. These impurities are less reactive than iron, forming a primary battery with iron in aqueous air (that is, a device that generates an electric current through REDOX), separating oxidation and reduction reactions, and making the steel corroded. Rust from steel corrosion problems is a loose porous structure with a number of microcracks connecting the pores. In this way, the rust acts like a sponge, continuing to absorb moisture from the air, further rusting the steel until it is completely passed.



Weathering steel is different from ordinary steel. At first, it will rust on the surface like normal steel. Due to its high degree of alloying, this development process is even faster than ordinary steel. However, due to the more complex lattice structure inside the weathering steel, there is a dense dark black rust layer growing under the loose rust layer on the surface. This rust layer can be composed of α-FeOOH nanomaterial particles. In this dense rust layer, nickel atoms replace some of the iron atoms, making the rust layer cation selective and controlling the penetration of corrosive anions.
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It is this dense rust layer that causes the surface of the weathering steel to rust, but the interior will not continue to rust. In fact, as long as we can carefully distinguish, it can be clearly seen that the surface of weathering steel and ordinary rust are not the same: the rust of weathering steel is uniform and dense, close to the surface of steel materials to protect our steel; Rust, on the other hand, is mottled, loose, porous, and will fall off when touched. Instead of protecting the steel, this corrosion draws water and oxygen to the steel surface.

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